Solve for both systems 2x+7z=19 and 7x + 3z = 45

7x + 3z = 45

7x -7x+ 3z = 45-7x

3z = 45-7x

3z/3 = 45-7x/3

z=15-2.33x

2x+7z=19

2x+7(15-2.33x)=19

2x+7(15) (7)(-2.33x)=19

2x+105-16.31x=19

105-14.31x=19

105-14.31x-105=19-105

-14.31x=-86

-14.31x/-14.31=-86/-14.31

x=6

z=15-2.33x

z=15-2.33(6)

z=15-13.98=1.02