In a jewlery store the owner paid $150 for a diamond ring. The owner marked the price up by 190% for sale to the customers. How
much will a customer pay for the diamond ring with 6% sales tax?

Assuming that the other point will have the coordinate of (4,7). we are given two points thus we can use the point slope form of a line to determine the equation. we do as follows:

y - y1 = m(x-x1)
y - 11 = (7-11/4-8) (x -8)
y - 11 = x -8
y = x + 3

since i am not   that sure about the second point. you can just use the method above to determine the correct equation. hope this .