exam Maths Puzzle Numerical Ability

what is the slope of a perpendicular line to the line
y=(2/3)x+2?

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exam Other Question

Are the following lines parrallel, perpendicular, or neither. L1 2x+4y=5 L2 x+2y=4

thanks for any help it is greatly appreciated

Heather
Determine whether the line through p1 (1,-2) and p2(4,-3) is parallel to the line through q1 (4,3) and q2 (7,4)