Tell whether the lines for the pair of equations are parallel, perpendicular, or neither.

Question

My equation is "line L1 has the equation 2x-5y=8 line L2 passes through the points (1,4) and (-1,-1). Determine whether these lines are parallel, perpendicular or neither." Im not sure how to solve this, any is appreciated!

Answer 1

Calculate the slopes of the 2 lines. If the slopes are equal, the lines are parallel. If the product of the slopes is -1, the lines are perpendicular. If neither condition applies, the lines are neither parallel or perpendicular.