Y = f(x) = -3x
Find f(x) when x = 3.
Enter the correct answer.

-9

Step-by-step explanation:

f(x) = -3x

Let x = 3

f(3)  = -3*3 = -9

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.