Is it possible for a system of equations composed of a linear function and a quadratic function to have 3 solutions?

Which of these choices show a pair of equivalent expressions?

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

What is the expression in factored form? 3x^2 + 18x + 24 a. 3(x+2)(x+4) b. 3(x-2)(x+4) c. 3(x-2)(x-4) d. 3(x+2)(x-4)