Question

Solve by substitution x+3y=72x-4y=24

Answer 1

X=10
y=-1
...................................................................

Answer 2

Frm Equation 1, X+3y=7, Make Y D Subject Of The Formula, Then Y=7-x/3(eqn 3), Insert Eqn3 In Eqn 2, 2x-4(7-x/3)=24, Multiply Throughout By 3, 6x-4(7-x)=24, 6x-28+4x=72, Collect The Like Term, 10x=100, Divide Both Sides By 10, X=10. Substitute X=10 In Eqn 3, Y=7-x/3, Y=7-(10)/3, Y=7-10/3, Y=-3/3, Y=-1. X=10, Y=-1