Help and explain thankyou

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).

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12