Question

3a - 3b = -15
-3a - 3b = -3

Answer 1

What method do you want to use?
Substitution or elimination?

Answer 2

I guess I should say which*

Answer 3

substitution

Answer 4

1st step:
Solve one equation for one variable.

Answer 5

3a - 3b = -15
-3a - 3b = -3
________________
-6b = -18
b= 18/6, b=3
put this value in any eq i will use the first
3a - 3(3) = - 15
3a=-15+9,
3a=-6
a=-2
this method would be more easier