Find x

Secant tangent angles

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

Is the point (0, 8) on the x-axis or y-axis? how do you know?

Can you me find the slope! (30 points)