You reflect triangle pqr, with vertices p(-2, -4), q(-3, -1), and r(-4, -4), across the y-axis to get triangle p′q′r′. what are the coordinates of triangle p′q′r′?

the answer to your question is b.

set the two equations for y equal to each other. solve for x. this will be the x-coordinate for the point of intersection. use this x-coordinate and plug it into either of the original equations for the lines and solve for y.