For questions 4-5, how many solutions does the system have?

4. -4y+4=x
2x+8y=8
a. one solution
b. two solutions
c. infinitely many solutions
d. no solution

5. 6x+2=y
3y-18x=12
a. one solution
b. two solutions
c. infinitely many solutions
d. no solution

Melissa is purchasing a $160,000 home and her bank is offering her a 30-year mortgage at a 4.9% interest rate. in order to lower her monthly payment, melissa will make a 20% down payment and will purchase 3 points. what will her monthly mortgage payment be? a. $645.98 b. $650.46 c. $662.93 d. $606.69