Answer:
-6.5
Step-by-step explanation:
-2(p - 1) = 15
-2p + 2 = 15
-2p = 13
p = -6.5
3x+y=5 & 5x-4y=-3
3x+5x=8x+y-4y=-3
8x+y-4y=-3
8x+3y=-3
-3 -3
8x=-6