Higher - The gradients of two perpendicular lines will always multiply to make –1. Make sure you are familiar with finding the equation of a line and calculating gradient to understand equations of ...

Blondie began to skyrocket to the big time as the '70s drew to a close. They'd first appeared on the scene at New York City's famed CBGB club in 1975, only to be dismissed as a '60s throwback pop ...

Horizontal lines run left to right, parallel to the horizon, with slope 0 and equation y = k. Vertical lines run top to bottom, perpendicular to the horizon, with undefined slope and equation x = k.