Which one is a proportional relationship

y=2x+5
y=18x
y=10x-7
y= 5+2x

If 3x+8=3x+8 is it one solution or no solution

The graph of a function f(x)=(x+2)(x-4). which describes all of the values for which the graph is negative and increasing? all real values of x where x< -2 all real values of x where -2

Prove that (x-2)is factor of p (x)=2x³-3x²-17x+30