Question

The pair of values below is from a direct variation. Find the missing value.

(3,8),(18,y)
y=?

Answer 1

• y = 48

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Direct variation equation:

• y = kx, where k - variation coefficient

Use the first pair of coordinates, x = 3 and y = 8 to find the value of k:

• 8 = 3k
• k = 8/3

The equation becomes:

• y = (8/3)x

Now use the value of x = 18 to find the missing coordinate:

• y = (8/3)*18
• y = 48