exam Maths Puzzle Numerical Ability

determine whether the lines through the paris of points are parallel, perpendicular, of neither

3x-12y=11
64x+12y=-18

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exam Other Question
Is pie a rational expression? I need help using the echelon method to solve each of two equations in two unknowns.

2x + 7y = -8
-2x + 3y = -12