Question

a) x-y=3 b) 2x+y=-3
x+5y=9 x+y=-1

Answer 1

$a)\\ x - y = 3 \\ x = 3 + y \\ \\ 3 + y + 5y = 9 \\ y + 5y = 9 - 3 \\ 6y = 6 \\ y = \frac{6}{6} \\ y = 1 \\ \\ x = 3 + 1 \\ x = 4 \\ \\ b) \\ 2x + y = - 3 \\ y = - 3 - 2x \\ \\ x + ( - 3 - 2x) = - 1 \\ x - 3 - 2x = - 1 \\ x - 2x = - 1 + 3 \\ - x = 2 \\ x = - 2 \\ \\ y = - 3 - 2 \times ( - 2) \\ y = - 3 + 4 \\ y = 1$