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15 May, 19:35

X+3y=15 and 4x+2y=30

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  1. 15 May, 20:55
    0
    Subsitution

    minus 3y from both sides in the first equatio

    x=15-3y

    subsitute 15-3y for x in other equation

    4 (15-3y) + 2y=30

    60-12y+2y=30

    60-10y=30

    minus 60 both sides

    -10y=-30

    divide both sides by - 10

    y=3

    sub back

    x=15-3y

    x=15-3 (3)

    x=15-9

    x=6

    (x, y)

    (6,3)
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