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Algebra Difficulty 1.2 Junior Find the answer Canada

If $2n+5 = 16$ , the expression $2n-3$ equals

Pick one

Solution

Since $2n+5=16$ , then $2n-3 = (2n+5)-8 = 16-8=8$ .

Alternatively, we could solve the equation $2n+5=16$ to obtain $2n=11$ or $n = \frac{11}{2}$ .

From this, we see that $2n-3 = 2(\frac{11}{2})-3=11-3=8$ .

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project.