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If y varies directly as x, and y is 18 when x is 5, which expression can be used to find the value of y when x is 11?

If y varies directly as x, and y is 18 when x is 5, which expression can be used to find the value of y when x is 11?
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1 vote
If y varies directly as x, and y is 18 when x is 5, which expression can be used to find the value of y when x is 11?

User Nazar Merza
by
7.8k points

1 Answer

3 votes
y=kx is the direct variation equation
First plug in the x, y values given to find K
18=k(5)
18/5=k
3.6 = k
Use the k and write a new equation.
y=3.6x
Plug in the x value to solve for y.
y = 3.6(11)
y= 39.6
User LiJung
by
8.2k points
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