Write an equation for the line through (2,2), y-intercept 10

Me answer number 3plz explain how you do it

Assume that a population of 50 individuals has the following numbers of genotypes for a gene with two alleles, b and b: bb = 30, bb = 10, and bb = 10. calculate the frequencies of the two alleles in the population’s gene pool.

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?