Answer:
4. false 1 is nor prime nor composite
d1 = ax + by + c = 0 and d2= mx + ky + f = 0
if they are parallel :

8x + 2y = 7
8x + 2y - 7 = 0
- 8x + 2y -9 = 0
- 4x + y -6 = 0
- 16x + 4y - 19 = 0
you can create more whatever you want =)
Hope this helps ^-^
(x + 10(x - 10)
x^2 + 10x - 10x -100
x^2 - 100
a. + (-10x)
b. 0x
c. + (-100)
d. (-100)