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Chapter 2: Q. 2.126 (page 271)

Solve the formula 5x+2y=18for y: 鈸� when x = 4 鈸� in general

Short Answer

Expert verified

a.Thesolutionforthegivenequationisy=-1b.Ingeneraly=9鈭�5x2

Step by step solution

01

Step 1. Given information

The given equation is5x+2y=18

We have to solve fory: 鈸� when x = 4 鈸� in general

02

Step 2. Part(a). Explanation

a.Solve:5x+2y=18Given,whenx=4鈬�5(4)+2y=18(Substitute)鈬�20+2y=18Multiply鈬�20鈭�20+2y=18鈭�20(Subtract20frombothsides)鈬�2y=鈭�2(Simplify)鈬�2y2=鈭�22(Dividebothsideby2)鈬�y=-1Thesolutionforthegivenequationisy=-1

03

Step 2. Part(b)

b.Ingeneral鈬�5x+2y=18鈬�5x鈭�5x+2y=18鈭�5x(Subtract5xfrombothsidestoisolateyterm)鈬�2y2=182鈭�5x2(Divide)鈬�y=9鈭�5x2(Simplify)

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