# math,correction

posted by
**jasmine20** on
.

can someone correct these for me i'll appreciate it thank.

dirctions: solve

3x-7=2x+8

my answer:

x = 15

directions: solve

2/5x=-10

my answer:

x = -25

Directions: solve

-3(x+1)=2(x-8)+3

my answer:

x= -3.2

1 looks ok.

Show your work on 2 and 3 and we can correct them.

okay this is what i did:

Directions: solve

2/5x = -10

My answer:

I caught my mistake i think so now i came up with the following:

2/5x =-10

---- ----

2/5 2/5

x = -1

Dirctions: SOLVE

-3(X+1)=2(X-8)+3

my answer: I tried it again but this is what i get now.

-3(x + 1 ) = 2(x -8 )+ 3

-3x - 3 = 2x -16 + 13

-3x -3 = 2x -3

+3 +3

-3x = 2x + 0

-2x -2x

-5x = 0

--- ---

-5 -5

x = 0

Directions: solve

2/5x = -10
**Multiply both sides by 5x.
5x*(2/5x)=-10*5x
2=-50x
Divide both sides by 50
2/50 = -50x/50
1/25 = -x
Multiply both sides by -1
-1/25 = x
Check my work.**

My answer:

I caught my mistake i think so now i came up with the following:

2/5x =-10

---- ----

**This is the hard way**

2/5 2/5

**You didn't do this step right.**

The left side is 1/x.

The right side is -25.

1/x = -25

and x = -1/25

The left side is 1/x.

The right side is -25.

1/x = -25

and x = -1/25

*I think you may not be inverting the denominator and multiplying.*

x = -1

Dirctions: SOLVE

-3(X+1)=2(X-8)+3

my answer: I tried it again but this is what i get now.

-3(x + 1 ) = 2(x -8 )+ 3

-3x - 3 = 2x -16 + 13

-3x -3 = 2x -3

+3 +3

-3x = 2x + 0

-2x -2x

-5x = 0

--- ---

-5 -5

x = 0

for number one , i thought in order to get x alone i had to divide it to the other side.

can you help me understand please.

let me see if i understood for number one:the answers that they have are the following for the solution options.

A) -4

B) 4

C)25

D)-25

solve for : 2/5x = -10

2/5x = -10 (2/5 is equal to .4)

.4x = -10

after i divide .4 by both sides i get

x = -25

then for number 2:

my options for the answers are:

A)-1

B)1

C)3

D)2

solve: -3(x +1) = 2(x -8 ) +3

-3(x + 1) = 2(x -8) + 3

-3x -3 = 2x - 16 + 3

-3x - 3 = 2x -13

+3 +3

-3x = 2x - 10

-2x -2x

-5x = -10

--- ---

-5 -5

x = 2

Actually I don't know which problem you are talking about but I presume it is the 2/5x = -10

You do need to get x to the other side but it is already in the denominator; therefore, you can't get it to the other side by dividing by x. You divided by 2/5 which will get rid of the 2/5 on the left side but it leaves 1/x. Your expression of

(2/5x)/(2/5)= (2/5x)*(5/2)= 1/x.

On the right side, you have

(-10)/(2/5) = -10*(5/2)= -50/2 = -25

SO, 1/x = -25 and of course then

x = -1/25

let me see if i understood for number one:the answers that they have are the following for the solution options.

A) -4

B) 4

C)25

D)-25

solve for : 2/5x = -10

The x = 2 is also correct.

2/5x = -10 (2/5 is equal to .4)

.4x = -10

after i divide .4 by both sides i get

x = -25

sorry now i know. i didn't knowx = -1

Dirctions: SOLVE

-3(X+1)=2(X-8)+3

**You should check your answer by putting the value you obtain back into the equation. You know the equation is right if the answer satisfies the equation. Neither x=0 nor x=-1 does that.**

First, clear the parentheses.

-3x-3=2x-16+3

subtract 2x from both sides.

-3x-2x-3=2x-2x-16+3

-5x-3=-16+3

Add 3 to both sides.

-5x-3+3=-16+3+3

-5x=-10

Multiply by -1

5x=10

Divide both sides by 5

5x/5=10/5

x=2

Check my work.First, clear the parentheses.

-3x-3=2x-16+3

subtract 2x from both sides.

-3x-2x-3=2x-2x-16+3

-5x-3=-16+3

Add 3 to both sides.

-5x-3+3=-16+3+3

-5x=-10

Multiply by -1

5x=10

Divide both sides by 5

5x/5=10/5

x=2

Check my work.

my answer: I tried it again but this is what i get now.

-3(x + 1 ) = 2(x -8 )+ 3

-3x - 3 = 2x -16 + 13

**+3 not 13**-3x -3 = 2x -3

+3 +3

-3x = 2x + 0

-2x -2x

-5x = 0

--- ---

-5 -5

x = 0

for number one , i thought in order to get x alone i had to divide it to the other side.

can you help me understand please.

let me see if i understood for number one:the answers that they have are the following for the solution options.

A) -4

B) 4

C)25

D)-25

solve for : 2/5x = -10

2/5x = -10 (2/5 is equal to .4)

.4x = -10

after i divide .4 by both sides i get

x = -25

then for number 2:

my options for the answers are:

A)-1

B)1

C)3

D)2

solve: -3(x +1) = 2(x -8 ) +3

-3(x + 1) = 2(x -8) + 3

-3x -3 = 2x - 16 + 3

-3x - 3 = 2x -13

+3 +3

-3x = 2x - 10

-2x -2x

-5x = -10

--- ---

-5 -5

x = 2

Actually I don't know which problem you are talking about but I presume it is the 2/5x = -10

You do need to get x to the other side but it is already in the denominator; therefore, you can't get it to the other side by dividing by x. You divided by 2/5 which will get rid of the 2/5 on the left side but it leaves 1/x. Your expression of

(2/5x)/(2/5)= (2/5x)*(5/2)= 1/x.

On the right side, you have

(-10)/(2/5) = -10*(5/2)= -50/2 = -25

SO, 1/x = -25 and of course then

x = -1/25

**OK. See below for what WE have been doing wrong.**let me see if i understood for number one:the answers that they have are the following for the solution options.

A) -4

B) 4

C)25

D)-25

solve for : 2/5x = -10

**When you write an equation this way I think you mean 2/(5x) = -10 while you actually mean (2/5)*x=-10. As I interpret the question, x = -1/25 and that accounts for why you thought I messed up and I thought you messed up. As you intended the question,**

x = -25.x = -25.

*You really must use parentheses, especially on these boards, so we will know what your question actually is.*The x = 2 is also correct.

2/5x = -10 (2/5 is equal to .4)

.4x = -10

after i divide .4 by both sides i get

x = -25

sorry now i know. i didn't know