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

y = 17.5

Step-by-step explanation:

Given y is directly proportional to x then the equation relating them is

y = kx ← k is the constant of proportion

To find k use the condition y = 5 when x = 2, thus

5 = 2k ( divide both sides by 2 )

2.5 = k

y = 2.5x ← equation of proportion

When x = 7, then

y = 2.5 × 7 = 17.5

answer:  

123455421

step-by-step explanation: easy

really really sorry if i'm

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