3x² - y² = 12 6x - 2y = 0 6x(1) - 2y = 0 6x - 2y = 0 -2y = -6x = = To use that, we must find y when x = 4 3x² - y² = 1 3(4)² - y² = 1 3*16 - y² = 1 48 - y² = 1 -y² = -47 y² = 47 y = = , substitute (4,) = = Edwin