Variables x and y are in direct proportion, and y = 35 when x = 2m. If x = 8m, then y = A) 4.375 B) 8.375 C) 70 D) 140

Question

Lexi

Mathematics

17 March, 17:39

Variables x and y are in direct proportion, and y = 35 when x = 2m. If x = 8m, then y = A) 4.375 B) 8.375 C) 70 D) 140

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Answers (2)

Know the Answer?

Alvin Dalton · Answer 1

Answer: D) 140

(both x and y are multiplied by 4)

Terrell Rich · Answer 2

D) 140

Step-by-step explanation:

The equation for direct variation is y = kx

If we know x and y we can solve for k

35 = k*2

Divide each side by 2

35/2 = k

Now the equation for direct variation is

y = 35/2 x

Given x=8 we can substitute in

y = 35/2 * 8

y = 140