Solving systems by substitution classwork – solve each of the following systems by substitution. x = 4y – 9 x = y + 3 5x = -2y + 48 x = -3y + 20 y – 4x = 28 y = -2x – 2 y + 2x = -12 y = x + 15 x = -2y – 7 2x + y = -14

The table below shows the approximate height of an object x seconds after the object was dropped. the function h(x)= -16x^2 +100 models the data in the table. for which value of x would this model make it the least sense to use? a. -2.75 b. 0.25 c. 1.75 d. 2.25