Can someone explain : special products of binomials to me

Line cd passes through points c(1, 3) and d(4, –3). if the equation of the line is written in slope-intercept form, y = mx + b, what is the value of b? –5 –2 1 5

Is fgh ~ jkl? if so, identify the similarity postulate or theorem that applies.

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76