The simultaneous equations are 2x - 7y = 4 (1) 3x + y = -17 (2)
Write (2) as y = - 3x - 17 (3)
Substitute (3) into (1). 2x - 7(-3x - 17) = 4 2x + 21x + 119 = 4 23x = -115 x = -5 This is the equation obtained after substituting y from the second equation into the first equation. The solution for y is y = -3(-5) - 17 = -2
8 square inches. You find area by length x height. A square's sides are all of equal length. So what number x itself is 64? The answer is 8 because 8 x 8 equals 64.
