exam Maths Puzzle Numerical Ability

how would I write this out in Ax + By + C = 0?

y - 15 = 12(x + 14)

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exam Other Question

-2.6y>1.3 A chemist needs to mix a 75% saltwater solution with a 50% saltwater solution to obtain 10 gallons of a 60% saltwater solution. How many gallons of each solution must be used?