The line represents the relationship between x, the number of hours it takes the painting company to finish the house, and y, the total cost of painting the house.

What is the slope of the line
Use the formula: (y2-y1) divided by ( x2-x1)

if y=4x then you will substitute 4x in for y in the second equation.

8x + 4x = 18 combine like terms

12x = 18 divide by 12 on both sides

x = 18/12 or 3/2

now replace x in the first equation with 3/2 to get

y = 4 3/2

y = 6

the answer is a

(3/2,6)

hope that .

brainliest is always apprectiated