Y varies directly with x, y=65 when x=5. How do you find y when x=12?

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Answer 1 · 2018-04-07T02:22:53

#156#

#y# varies directly with #x#

#y ∝ x#

#y = kx color(white)(...)["where"\ k = "proportionality constant"]#

When #y = 65, x = 5#

#65 = k × 5#

#k = 65/5 = color(blue)(13)#

When #x = 12#

#y = kx = color(blue)(13) × 12 = 156#