Kelly makes $10 more per hour than her regular pay when she is working overtime. Yesterday, she worked 8 regular hours and 4 overtime hours and earned $160.
What is Kelly's regular pay per hour?
Let's use the variable "x" to represent Kelly's regular pay per hour.
According to the problem, when she works overtime, she makes $10 more per hour, which means she would be making "x + 10" dollars per hour during overtime.
Yesterday, she worked 8 regular hours and 4 overtime hours, for a total of 12 hours. We can set up an equation using the distributive property to represent her total earnings:
8x + 4(x + 10) = 160
Now we can simplify the equation by distributing the 4:
8x + 4x + 40 = 160
Combining like terms:
12x + 40 = 160
Subtracting 40 from both sides:
12x = 120
Dividing both sides by 12:
x = 10
Therefore, Kelly's regular pay per hour is $10.