exam Maths Puzzle Numerical Ability

Find the slope of any line perpendicular to the line through points (0, 5) and
(-3,-4).

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exam Other Question

Determine which two equations represent parallel lines.
(a) y = 3/7 x + 4
(b) y = 7/3 x + 9
(c) y = 7/3 x - 9
(d) y = - 3/7 x + 9
How do you convert percents into decimals and decimals into percents?