Question

a) -6a = -42 b) 3 = 7a - 11 c) 5 - a = 8 d) a/7 - 1 = -4


Which one doesn't belong? If someone can please help, that would be great!!

Answer 1

Answer:

$a) - 6a = - 42 \\ solution . \\ a = \frac{ - 42}{ - 6} \\ a = 7 \: \: answer... \\ b) \: 3 = 7a - 11 \\ solution. \\ 11 + 3 = 7a \\ 14 = 7a \\ \frac{14}{7} = a \\ 2 = a \\ or \: \: \: a = 2 \: answer... \\ c) \: 5 - a = 8 \\ solution. \\ - a = 8 - 5 \\ - a = 3 \\ a = - 3 \: \: answer... \\ d) \: \: \frac{a}{7} - 1 = - 4 \\ solution. \\ \frac{a}{7} = - 4 + 1 \\ \frac{a}{7} = - 3 \\ a = - 3 \times 7 \\ a = - 21 \: \: \: answer...$