Question

The variables x and y vary directly. Use the given values to write an equation that relates x and y: x = 3, y = 15

Answer 1

6x-3=y

Answer 2

If they vary directly, that means
y = cx for some value c.
Solve for c by plugging in the x and y we know
15 = 3c
so, c = 5
The equation that relates x and y is y = 5x

Answer 3

The formula for direct variation is y = kx

15 = 3x
/3 /3

x = 5

So, 15 = 3(5)

15 = 15 so true :3

Answer 4

it said that make an equation so i make it complicated but the simplest is 5x=y :D

Answer 5

Thank you