A group of students takes their math teacher out for lunch. If five have hamburgers and four have hotdogs the bull will be 19.50.If four have hamburgers and five have hot dogs the bull wil be 18.75.What is the price of a hamburger and a hot dog?Show all work using systems of equations

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Solve the system of equations. y= 2x y= x^2 - 15

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