Question

x=y^2-1
2x-y=4
Which of the following equations could be the result of using substitution to solve the system?

2y^2-y-5=0
2y^2-y-6=0
2y^2-2y-5=0

Answer 1

solve 2x-y=4 for x and plug it into x=y^2-1

Answer 2

2y^2-y-6=0

Answer 3

Thanks :D

Answer 4

np