math,correction
posted by jasmine20 .
can someone correct these for me i'll appreciate it thank.
dirctions: solve
3x7=2x+8
my answer:
x = 15
directions: solve
2/5x=10
my answer:
x = 25
Directions: solve
3(x+1)=2(x8)+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(X8)+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
I think you may not be inverting the denominator and multiplying.
x = 1
Dirctions: SOLVE
3(X+1)=2(X8)+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.
3x3=2x16+3
subtract 2x from both sides.
3x2x3=2x2x16+3
5x3=16+3
Add 3 to both sides.
5x3+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. 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
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