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3 years ago

The value of y varies directly as x and y is 15 when x is 5 what is the value of y when x is 19

Mathematics

2 answers:

e-lub [12.9K]3 years ago

7 0

Answer:

Divide the known y and x:

15/5 = 3

Y is 3 times as much as x.

Now multiply X by 3 to find y:

Y = 19 * 3 = 57

klio [65]3 years ago

7 0

Answer:

y = 57

Step-by-step explanation:

Given that y varies directly as x then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition y = 15 when x = 5

k = $\frac{y}{x}$ = $\frac{15}{5}$ = 3, hence

y = 3x ← equation of variation

When x = 19 then

y = 3 × 19 = 57

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