Question

2. If y is directly proportional to x and y = 21 when x = 2, find the value of y when
x=4.​

Answer 1

Answer:

42

Step-by-step explanation:

when x=2 then y=21

so, when x=1,y=21/2

hence when x=4,y=21×4/2=21×2=42

Answer 2

Answer:

y = 42

Step-by-step explanation:

$\frac{x}{y} = k$

x is directly proportional to y.

21/2 = 4/y

2y = 21×4

2y = 84

y = 84/2

y = 42

Hope this helps

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