exam Maths Puzzle Numerical Ability

Find the equation, in standard form, with all integer coefficients, of the line perpendicular to 3x - 6y = 9 passing through (-2,-1)

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exam Other Question

How much of an alloy that is 20% copper should be mixed with 200 ounces of an alloy that is 50% copper in order to get an alloy that is 30% copper? Find the slope-intercept form of the line that contains the following points: (8, -3) and (-8, 3).