The range of the function f(k) = k^2 + 2k + 1 is {25, 64}. what is the function’s domain? a. {5,8} b. {-5, -8} c. {3, 8} d. {4, 7} e. {4, 8}

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18