Solve by using the substitution method y = -2x
7x - 8y= -23

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

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out

Mario has $14.35 left in his wallet. he spent $148.43 for tablecloths. then, he spent $92.05 for napkins. how much money did mario have in his wallet to start with?