exam Maths Puzzle Numerical Ability

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Section 10.3, page 648
Problem 66) Stabilization ratio. The stabilization ratio (births/deaths) for South and Central America can be modeled by the formula y

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exam Other Question

together, lauren and aaoron sold 456 raffle tickets. lauren sold 24 more than aaoron. how many did lauren sell? What is -y + 10 = 25? I did:
-y + 10 = 25
-25 -25
-y = -15
-1(-y) = -1(-15)
y = 15
Am I right?