Question

I need help solving an equation using the elimination method? The equation is a + 9b =1, a +4b = -4

Answer 1

ok line them up vertically and eliminate a because it's quicker os it becomes:
a + 9b = 1
a +4b = -4

Answer 2

then you subtract to eliminate a and getting: 5b = 5

Answer 3

solving for b which you divide 5 on both sides to get b as 1. Then you substitute the value of b into one of the equations to get a. I think you can do that right? Tutors allow the student to solve the last step. Do you understand how to do the elimination method?

Answer 4

I am supposed to substitute the 1 for b and solve the first equation?

Answer 5

Yes you substitute 1 for b and it can be any of the 2 equations.

Answer 6

I got -8 for the answer for a. Is that correct?

Answer 7

Yes. it's correct! :]

Answer 8

Thank you so much for your help. I was not sure I was working this equation right. Have a great day.

Answer 9

You too and you're welcome :]