Question

Solve the following system using the substitution method.

x + 6y = -5
2x - 9y = -17

Answer 1

Anyone know how to do this?

Answer 2

1) x=-6y-5
2) 2x-9y=-17

substitute (1) in (2)
2(-6y-5)-9y=-17
-12y-10-9y=-17
-21y=10-17
-21y=-7
3)\[y=\frac{ 1 }{ 3}\]
substitute (3) in (1):
\[x=-6(\frac{ 1 }{ 3 })-5=-7\]

Answer 3

What is the best first step to solve the system using elimination?

x - 5y = 4
3x + 7y = -17

Answer 4

multiply fist equation by 3 and then substract them