Posted by barb on Friday, August 6, 2010 at 10:25am.
Can someone please help me with these problems?Out of 35 problems these are the ones I can not figure out.Please show all of the stepswith no shortcuts. I am sincerely trying to learn this stuff.Thanks
4y2+y+36=7y+405y
5.3x5.36=4.246.7x
6(x+4)=8(x2)
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 11:07am
Here's the first one.
4y2+y+36=7y+405y
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 11:50am
5.3x5.36=4.246.7x
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(x2)
6x+24=8x16
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)+(^A19)+A=180 degrees
10A19=180
10A19+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 12:39pm
The first one is correct.
However, you forgot to subtract in the second problem.
6(x+4)=8(x2)
6x+24=8x16
6x  8x = 24 + (16)
Your third answer is correct.

math  barb, Friday, August 6, 2010 at 1:03pm
Is 20 the correct answer to the problem?
6(x+4)=8(x2)
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 1:08pm
Yes. 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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