Suppose y varies directly with x. Write an equation relating x and y.
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a.
y = 6x
c.
y = 7x
b.
y = x
d.
y = − x
a.
y = 6x
The correct equation relating x and y when y varies directly with x is:
c. y = 7x
To write an equation relating x and y when y varies directly with x, you use the form:
y = kx
where k is the constant of variation.
Looking at the given options, we can see that the correct equation is:
a. y = 6x
Therefore, the answer is (a) y = 6x.