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6 February, 03:31

Solve by substitution

x+3y=7

2x-4y=24

+5
Answers (2)
  1. 6 February, 05:12
    0
    X=10

    y=-1

    ...
  2. 6 February, 06:43
    0
    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
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