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21 February, 22:35

143=7+8 (3-7x) solve and justify

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  1. 21 February, 23:49
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    Justify means plug answer in and verify

    so distribute 8 (3-7x) = 24-56x

    143=7+24-56x

    143=31-56x

    minus 31 both sides

    112=-56x

    divide both sides by - 56

    -2=x

    justify

    plug it back

    143=7+8 (3-7x)

    143=7+8 (3-7 (-2))

    143=7+8 (3 - (-14))

    143=7+8 (3+14)

    143=7+8 (17)

    143=7+136

    143=143

    true

    x=-2
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