how long must the sides of an equilateral triangle be in order for the perimeter to be greater than 45m?

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.