A little help please ☹️?

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.

Issof claims that the scale factor is 1/2. which statement about his claim is correct

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15