exam Maths Puzzle Numerical Ability

Find an equation of the line containing the given pair of points
(1/4, -1/2) and (3/4, 6)

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exam Other Question

How would you solve this equation, by either using the substitution method or the elimination method?

3x/4-y/3=7/6

x/2+2y/3=5/3
Pencils sell at D dollars for 1 dozen. At this price, what would be the total cost of M pencils?