Question

c)
3a + 8b = 20
8a - 8b = -12​

Answer 1

Explicación paso a paso:

$3a + 8b = 20 \\ a = \frac{20 - 8b}{3} \\ </p><p>8a - 8b = -12 \\ a = \frac{ - 12 + 8b}{ 8}$

i

$igualamos \\ \frac{20 - 8b}{3} = \frac{ - 12 + 8b}{8} \\ 8(20 - 8b) = 3( - 12 + 8b) \\ 160 - 64b = - 36 + 24b \\ 160 + 36 = 24b + 64b \\ 196 = 88b \\ b = \frac{196}{88}$