Question

matemática

x-5y=-7
5x-5y=5
​

Answer 1

$x - 5y = - 7 \\ x = 5y - 7 \\ x = 5 \times (2) - 7 \\ x = 10 - 7 \\ x = 3$

$5x - 5y = 5 \\ 5 \times (5y - 7) - 5y = 5 \\ 25y - 35 - 5y = 5 \\ 25y - 5y = 5 + 35 \\ 20y = 40 \\ y = \frac{40}{20} \\ y = 2$