Question

write the four solution of the equation 2x + y=7

Answer 1

$2 \times1 + y = 7 \\ y = 5 \\ 2 \times 2 + y = 7 \\ y = 3 \\ 2 \times 3 + y = 7 \\ y = 1 \\ 2 \times 4 + y = 7 \\ y = - 1$