Answer:
The total cost is given by equation
y = 25 + 50 x
Where y  represents the total cost and x represents the hours he worked.
Step-by-step explanation:
Given : A plumber charges $25 to come to a home, and $50 per hour for a repair.
We have to determine the equation gives the total cost, y, for a repair that lasts x hours.
Since, given y represents the total cost
and x represents the hours he worked.
also, he charges $25 to come to a home,
and $50 per hour for a repair.
so , for x hours he charge 50 x
Thus, The total cost is given by equation
y = 25 + 50 x
