Question

The repair bill, y, of a car is proportional to x, the number of labor hours. The constant of proportionality is 42.50. Which will check that y is proportional to x?
Graph y=42.50 x and check that the graph is a straight line that goes through (0,0)
Graph x=42.50 y and check that the graph is a straight line that goes through (0, 0)
Graph y=42.50 x and check that the graph is a straight line that goes through (1, 0)
Graph y= 42.50 x and check that the graph is a straight line that goes through (1, 40)

Answer 1

Answer:

Graph y=42.50 x and check that the graph is a straight line that goes through (0,0)

Step-by-step explanation:

we know that

A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form $k=\frac{y}{x}$ or $y=kx$

In this problem we have

$k=42.50$

so

$\frac{y}{x}=42.50$

therefore

$y=42.50x$

Graph y=42.50 x and check that the graph is a straight line that goes through (0,0)