Answer:
y=3x+25
Step-by-step explanation:
For the equation y=3x+5, the slope is 3. Since the line will be parallel to it then this is the slope of the new line as well. Use the point-slope form to write the equation, then simplify and convert into the slope intercept form.
(y-13)=3(x--4)
y-13=3x+12
y=3x+25
The answer is D. Every half an hour it goes up by 30, so every hour is 60
50-35.65
=15.35 Rs is the amount the boy got from the shopkeeper
The equation is separable, so solving it is trivial:

Integrating both sides gives

Given
and
, we find


so the answer is E.