# How did I get this math answer?

My length is (9y-1), my width is 5

I get (18y+8) for perimeter

### 5 Answers

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- JeremyLv 68 months ago
l = length; w = width; P = perimeter.

Formula: P = 2 * (l + w) = 2 * ((9y - 1) + 5) = 2 * (9y + 4) = 2 * 9y + 2 * 4 = 18y + 8.

- Anonymous8 months ago
How should I know HOW you got that answer?????????

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- PhilipLv 68 months ago
perimeter, P, = 2(length + width). Here length = (9y-1) and width = 5. Therefore P=

2[(9y-1)+(5)] =2(9y+4) = 18y +8.

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