What is the value of the function y=18x−13 when x=−4?
a. −16
b. −12.5
c. −13.5
d. −15
a. -16
Plugging in x = -4 into the function y = 18x - 13, we get:
y = 18(-4) - 13
y = -72 - 13
y = -85
Therefore, the value of the function y = 18x - 13 when x = -4 is -85.