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Solve the given system of equations. 2y= -x+9 , 3x-6= -15

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?