A health club charges a one-time sign up fee of $99.99 plus a monthly charge of $12.75. A new member paid a total of $189.24 when she signed up. For how many months did she pay? (A)7
(B)15
(C)22
(D)77

A. 7

Step-by-step explanation:

189.24 - 99.99 = 89.25

89.25 ÷ 12.75 = 7

f(x) = y

f(-3) = -5

step-by-step explanation:

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