Can someone me with this question?

What is a graph with a never ending line called?

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).

If you measured the width of a window in inches and then in feet with measurement would you have the greater number of units