Which triangle is NLM congruent to ? Please answer URGENT

What will the graph look like for a system of equations that has no solution? a. the lines will be perpendicular. b. the lines will cross at one point. c. both equations will form the same line. d. the lines will be parallel.

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0