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April 21, 2015

April 21, 2015

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

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