Solve for both systems: y+5x=21 and 5y + 3x = 61

y+5x=21

y+5x-5x=21-5x

y=21-5x

5y + 3x = 61

5(21-5x) + 3x = 61

5(21) (5)(-5x) + 3x = 61

105-25x+3x=61

105-22x=61

105-22x-105=61-105

-22x=-44

-22x/-22=-44/-22

x=2

y=21-5x

y=21-5(2)

y=21-10=11