7times the sum of a squared and b minus 4 times the sum of a squared and b

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

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

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11