Answer:
Step-by-step explanation:
2x²+7x=-3
2x²+7x+3=0
2x²+x+6x+3=0
x(2x+1)+3(2x+1)=0
(2x+1)(x+3)=0
x=-1/2,-3
so C
x=16, y=-4
-1(x-y=12)
x+7y=-20
-x+y=-12
8y=-32
y=-4
x-4=12
x=16
Answer:x=143
Step-by-step explanation: set 128=X-15 add 15 to both sides