I don't understand this problem, can someone help please?

An assembly consists of two mechanical components. suppose that the probabilities that the first and second components meet specifications are 0.87 and 0.84. assume that the components are independent. determine the probability mass function of the number of components in the assembly that meet specifications. x

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15