Solve for both systems: 10x+y=47 and 3y + 4x = 37

10x+y=47

10x-10x+y=47-10x

y=47-10x

3y + 4x = 37

3(47-10x) + 4x = 37

3(47) (3)(-10x) + 4x = 37

141 -30x+ 4x = 37

141 -26x= 37

141 -26x-141= 37-141

-26x=-104

-26x/-26=-104/-26

x=4

y=47-10x

y=47-10(4)

y=47-40=7