Which problem can be solved by this number sentence? 3 × 7 = 21

correct answers below:

y=3x+4

step-by-step explanation:

given the points a(0,4) and b(-4, -8)

eqn of line ab: (y-4)/(x-0)=(-8-4)/(-4-0)

(y-4)/x=-12/-4=3

y=3x+4

the answer on ed. is:

c. "the graph of f(x) has exactly two x-intercepts."

hope i could someone! : )