Question

If y varies directly with x, and y = 35 when x = 5, find x when y = -7

A. 1
B. 7
C. -1
D. -5

Answer 1

It is C
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Answer 2

Answer:

$x = -1$

Step-by-step explanation:

This is a case of direct proportionaly, that is:

$y \propto x$

$y = k\cdot x$

Where k is the proportionality constant, which is:

$k = \frac{y}{x}$

$k = \frac{35}{5}$

$k = 7$

The value of x when y = -7 is:

$x = \frac{y}{k}$

$x = -\frac{7}{7}$

$x = -1$