1. solve the following pair of simultaneous equations.
6f + e = 23
2e - f = 7
2. solve the question 1 above graphically, i. e using straight line graphs. show all relevant points

Harry owes the bank money. to repay his debt, he paid $150 back to the bank each month. after 10 months, his remaining debt was $6900. what was the original amount of harry's debt? how long did it take harry to pay back his entire debt?