In ΔJKL, \text{m}\angle J = (8x-7)^{\circ}m∠J=(8x−7) ∘, \text{m}\angle K = (x+7)^{\circ}m∠K=(x+7) ∘ , and \text{m}\angle L = (2x+15)^{\circ}m∠L=(2x+15) ∘ . What is the value of x?X?

Suppose you are an avid reader and are looking to save money on the cost of books instead of paying about $20 for each book, you decide to look into purchasing a kindle for $120 you can purchase e-books for about $5 each 1. find the slope-intercept equation for the cost of the hard copy of books using x to represent the number of books 2. find the slope-intercept equation for the cost of the kindle with cost of e-books using x to represent the number of books