Solve for the system using substituion. 7x-8y=112y=-2x+9

Answer:You substitute the y-value of the second equation into the first:

→7x-8⋅ (-2x+9) = 112

→7x+16x-72=112

→23x=184→x=18423=8

Now put back the value of x in the second equation:

y=-2⋅8+9=-7

So x=8andy=-7

Check your answer with the first equation:

7⋅8-8⋅ (-7) = 56 - (-56) = 112 check

(8, - 7) is your answer