exam Maths Puzzle Numerical Ability

find an equation of the line satisfying the given conditions.

parallel to the line 2x+y=3 and through (-2,3)

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exam Other Question

How do you solve (x+b)(x-b)=x(x-5) for x? I would like to see every step and it would be nice if you could explain why you did each step. Thank you very much. A metal alloy is 25% copper. Another metal alloy is 50% copper. How much of each alloy should be mixed to create 1000 grams of an alloy that is 45% copper?