Question

5a+2b=-28
-5a+b=46
What is the solution?

Answer 1

What I would do is add 5a to the bottom equation which will turn out as b=5a+46. Then I will plug it in into the top which the equation will look like 5a+2(5a+46)=-28. And then do the 2(5a+46) which is 10a+92. Now the equation will look like this, 5a+10a+92=-28 and then subtract 92 on both sides.then divide by 15

Answer 2

I think there is an easier way to do this:
A) 5a+2b=-28
B) -5a+b=46
Add the 2 equations which results in
3b = 18
b = 6
Now you already have one of the unknowns solved.
"Plug" the value of b (which is 6) in to either Equation A or B to get the value of a.

Answer 3

yup that works too