Question

How do you solve the system 7x−8y=112 and y=−2x+9 by substitution?

Answer 1

y=-2x+9

therefore, 7x-8 (-2x+9)=112

7x+16x-72=112

23x =112+72

23x=184

x=184/23

x=8

hope it works. pls mark as brainliest.