Question

(-1,5)
-x+y=6
2x+3y=13

find if the equations are true by substituting

Answer 1

-x+y=6
$-( - 1 )+ 5 = b \\ 6 = b$
it's true



2x+3y=13
$2 \times ( - 1) + 3 \times 5 = b \\ - 2 + 15 = b \\ 13 = b$
it is correct




good luck