Question

solve by substitution method: -8x+7y,9y= -18

Answer 1

Answer:

answer

Step-by-step explanation:

$- 8 + 7y = - 18 \\ = 7y = - 18 + 8 \\ = 10 \\ = y =10 \\ \\ \frac{10}{9} \\\ then \\sbstituing \: \\ \frac{10}{9} = 9y = - 18 \\ = (- 18 )- 9 \\ = 9$