Solve for both systems 3y+11x=107 and 7y + 2x = 84

7y + 2x = 84

7y-7y + 2x = 84-7y

2x = 84-7y

2x/2 = 84-7y/2

x=42-3.5y

3y+11x=107

3y+11(42-3.5y)=107

3y+11(42) (11)(-3.5y)=107

3y+462-38.5y=107

462-35.5y=107

462-35.5y-462=107-462

-35.5y=-355

-35.5y/-35.5=-355/-35.5

y=10

x=42-3.5y

x=42-3.5(10)

x=42-35=7