Thursday

November 27, 2014

November 27, 2014

Posted by **barb** on Friday, August 6, 2010 at 10:25am.

4y-2+y+36=7y+40-5y

5.3x-5.36=4.24-6.7x

6(x+4)=8(x-2)

In a triangle ABC, angle B is 3 times angle A and angle C is 19 degrees less than 6 times A. What is the size of angle A?

- math -
**Ms. Sue**, Friday, August 6, 2010 at 11:07amHere's the first one.

4y-2+y+36=7y+40-5y

4y + y -7y + 5y = 2 - 36 + 40

3y = 6

y = 2

Follow the above procedure and try the others. I'll be glad to check your answers.

- math -
**barb**, Friday, August 6, 2010 at 11:50am5.3x-5.36=4.24-6.7x

5.3x+6.7x=4.24+5.36

12x=9.6

12x/12=9.6/12

x=.8 If this is wrong can you illustrate what corrections need to be made?

6(x+4)=8(x-2)

6x+24=8x-16

14x=24+16

14x=40

14x/14=40/14

x=2.8571428

that does not even sound right

In a triangle ABC, angle B is 3 times angle A and angle C is 19 degrees less than 6 times A. What is the size of angle A?

(3A)+(^A-19)+A=180 degrees

10A-19=180

10A-19+19=180+19

10A=199

10A/10=199/10

A=19.9 degrees.

I wouldappreciate any advice you can give me to understand this math. I am about to lose it. Thank you so much.

- math -
**Ms. Sue**, Friday, August 6, 2010 at 12:39pmThe first one is correct.

However, you forgot to subtract in the second problem.

6(x+4)=8(x-2)

6x+24=8x-16

6x - 8x = -24 + (-16)

Your third answer is correct.

- math -
**barb**, Friday, August 6, 2010 at 1:03pmIs 20 the correct answer to the problem?

6(x+4)=8(x-2)

I just checked and if I checked right,20 is the answer.What is the rule for getting like variables together. Do you always subtract the right from the left?

- math -
**Ms. Sue**, Friday, August 6, 2010 at 1:08pmYes. 20 is correct.

Not necessarily. You want to get the unknowns on one side and the knowns on the other side.

Examples:

2x + 5 = 11

2x + 5 - 5 = 11 - 5

11 = 2x + 5

11 - 5 = 2x + 5 - 5

**Answer this Question**

**Related Questions**

Math 115 - I need help with these problems 1. 18kg=______g I don't understand ...

Math - I'm doing some word problems on finding the areas of rectangles, its just...

Geometry Question plz help - Could someone please explain how to figure this out...

algebra - Can someone please explain these problems to me I have tried and ...

math - please help me figure out how to do thes problems 4. y/2+5=-12 6. x/3-9=0...

Chemistry - Suppose that 2.3 L of gas at 35°C and 1.0 atm is expanded to 4.5 L ...

7th grade math help Ms. Sue please - How do you find the sales tax of something...

math - Find f'(a) for f(x)=4x3+1x f'(a) =? please please help. i just need to ...

Math - I can't figure any of these problems out any help would be nice peace. ...

Algebra-I really need help, please? - I have to solve sqrt(2x-7) >=5 answers ...