How can you show that two objects are proportional with a graph?

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then

Ricky takes out a $31,800 student loan to pay his expenses while he is in college. after graduation, he will begin making payments of $190.66 per month for the next 30 years to pay off the loan. how much more will ricky end up paying for the loan than the original value of $31,800? ricky will end up paying $ more than he borrowed to pay off the loan.

What is 1/3x5 on anuber line what does it look like on a number line