Solve the system of equation by substitution
y=-2x+9
-8y=16x-72

Which recursive formula can be used to determine the total amount of money earned in any year based on the amount earned in the previous year? f(n+1)=f(n)+5

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).

Factor x2 – 8x + 15. which pair of numbers has a product of ac and a sum of what is the factored form of the