Solve for both systems: 2x + 7z = 86 and -2x+3z=14

2x + 7z = 86

2x + 7z-7z = 86-7z

2x= 86-7z

2x/2= 86-7z/2

x=43-3.5z

-2x+3z=14

-2(43-3.5z)+3z=14

-2(43) (-2)(-3.5z)+3z=14

-86+7z+3z=14

-86+10z=14

-86+10z+86=14+86

10z=100

10z/10=100/10

z=10

x=43-3.5z

x=43-3.5(10)

x=43-35=8