Answer:
Correct option is C) x also increases 5 times .
Explanation:
Given:
y=7x
The above equation can be rewritten as

Now, if we increase the y 5 times then we would have,

Which is also equal to
x'=5x
Hence we can say that if we increase the value of y 5 times then we get that the value of x also increases 5 times.