7x - y = -5
Step-by-step explanation:
7x + 3 = 5
y - 1 -1 = 6 -1(subtracting 1 from both sides )
so we have,
7x + 3 = 5 (1)
y - 2 = 5(2)
since equ (1) and (2) are equal
7x + 3 = y - 2
7x - y = -2 - 3