What is the dependent variable and what is the independent variable?

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

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

Which letters from the table represent like terms? a and b b and c a and d b and d