exam Maths Puzzle Numerical Ability

Are the following lines parellel, perpendicular, or neither?

L1 through (-4, -7) and (1, 3)
L2 through (2, 6) and (4, 10)

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exam Other Question

v=√(2gE/m),for g the angles of a triangle have the following measures: angle A= (3x+8) degrees; angle B = (9x-3) degrees; and angle C = (4x-1) degrees. Determine the measure of each angle.