12.
3x - y = 7
when x = -5.....
3(-5) - y = 7
-15 - y = 7
-15 - 7 = y
-22 = y...so this one is (-5,-22)
when x = 0
3(0) - y = 7
-y = 7
y = -7.....so this one is (0,-7)
when x = 4
3(4) - y = 7
12 - y = 7
-y = 7 - 12
-y = - 5
y = 5...so this one is (4,5)
13. u r correct on these
