Solve for both systems 7y+6z=151 and 13y + 4z = 209

7y+6z=151

7y-7y+6z=151-7y

6z=151-7y

6z/6=151-7y/6

z=25.67-1.167y

13y + 4z = 209

13y + 4(25.67-1.167y) = 209

13y + 4(25.67) (4)(-1.167y) = 209

13y + 102.68-4.67y = 209

8.33y +102.68= 209

8.33y +102.68-102.68= 209-102.68

8.33y=106.32

8.33y/8.33=106.32/8.33

y=12.76

z=25.67-1.167y

z=25.67-1.167(12.76)

z=25.67-14.90=10.77