Solve for both systems: 3y + 2z = 25 and 13y-2z=23

3y + 2z = 25

3y-3y + 2z = 25-3y

2z = 25-3y

2z/2 = 25-3y/2

z=12.5-1.5y

13y-2z=23

13y-2(12.5-1.5y)=23

13y-2(12.5) (-2)(-1.5y)=23

13y-25+3y=23

-25+16y=23

-25+16y+25=23+25

16y=48

16y/16=48/16

y=3

z=12.5-1.5y

z=12.5-1.5(3)

z=12.5-4.5=8