What value is a discontinuity of x^2+2x+3/x^2-x-12?

Matt and brian were solving a system of equations. they both noticed that the two lines had the same slope. brian said that because each line in the system had the same slope, the two lines had to be parallel, which meant the solution to the system was "no solution" matt disagreed, and said they should also look at the y-intercepts before determining how many solutions there were. who is correct?

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

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