Brenda's hourly rate is $12 per hour. The correct option is A, $12 per hour.
What is a linear equation?
A linear equation is an equation in which each term has at max one degree. Linear equation in variables x and y can be written in the form y=mx+c.
Linear equation with two variables, when graphed on a cartesian plane with axes of those variables, give a straight line.
For the given situation the linear function graphed below represents Brenda's monthly cell phone bill based on the number of hours she uses. Therefore, Brenda's hourly rate for the cell phone bill is the slope of the given graph. Thus, Brenda's hourly rate can be written as,
Brenda's hourly rate = ($51 - $27) / (3 - 1) hours
= $24 / 2 hour
= $12 per hour
Hence, Brenda's hourly rate is $12 per hour.
Learn more about Linear equations here:
https://brainly.com/question/27465710
#SPJ5
