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6 January, 13:25

Use substitution to solve the system - 5x+2y=20 and x=3y-17

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  1. 6 January, 13:42
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    -5 (3y-17) + 2y=20, - 15y+85+2y=20, - 13y+85=20, - 13y=-65, y=5, x=3 (5) - 17, x=15-17, x=-2, - 5 (-2) + 2 (5) = 20, 10+10=20, 20=20
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