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Rosa
Mathematics
1 October, 17:07
143=7+8 (3-7x) solve and justify
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Marcel Lang
1 October, 17:10
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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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