For the following system, if you isolated x in the first equation to use the Substitution Method, what expression would you substitute into the second equation?

−x + 2y = 9
4x + 5y = 9

−9 + 2y

−9 − 2y

9 − 2y

9 + 2y

Question

For the following system, if you isolated x in the first equation to use the Substitution Method, what expression would you substitute into the second equation?

−x + 2y = 9
4x + 5y = 9

 −9 + 2y

 −9 − 2y

 9 − 2y

 9 + 2y

anonymous · Answer

−9 + 2y

immings · Answer

(times by -4) 4x - 8y = -36         l   (times 5)                          -5x + 10y = 45
minus            4x +5y = 9             l  (times 2 then subtract.) (-) 8x + 10y = 18
                      0x -13y = -45      l                                           -13x = 27
                           y= -45/-13      l                                             x= 27/-13