Question

if y is directly proportional to X2 and y=18 when x = 3,(1) find an equation connecting x and y, (2) find the value of y when x=5, (3) calculate the value of x when y=32, (4) draw the graph of y against X2​

Answer 1

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shah9

shah9

28.04.2017

Math

Secondary School

+5 pts

Answered

If y directly proportional to x and if y =5 when X= 2, find the value of y when x= 7

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Praneethworldtopper

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Hai friend ,

here is your answer,

y∝ x

so,

y=kx

y/x =k

here k is the proportionality constant

First case ➡

x =2

y =5

so here k=5/2

Applying k to second case

Second case ➡

y=?

x=7

k=y/x

5/2 = y/7

5/2*7=y

35/2=y

17.5=y