Solve for both systems: y+7z=98 and 7y + 8z = 112

y+7z=98

y+7z-7z=98-7z

y=98-7z

7y + 8z = 112

7(98-7z ) + 8z = 112

7(98) (7)(-7z ) + 8z = 112

686-49z+ 8z = 112

686-41z= 112

686-41z-686= 112-686

-41z=-574

-41z/-41=-574/-41

z=14

y=98-7z

y=98-7(14)

y=98-98=0