50^2 what is this equation for the problem

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827