1. Solve the system of equations using the substitution method: (10 points) fx3y=4 xy=4 2. Solve the System of equations using the addition method {elimination}: (10 points) 4x+3x=15 3x5y=4 3. Write a system of equations for this situation. Define your variables. Do not solve the system; just write the appropriate system of equations. (10 points) A woman sold her house and moved into a smaller house. She made a considerable profit on the house sold, $120,000. She did some research into three investment options: municipal bonds paying 4%, mutual fund #1 paying 5.5% and mutual fund #2 paying 7%. Her earned interest the first year was $6750. She invested $10,000 more in mutual fund #1 than in mutual fund #2. 4. Solve the system of non-linear equations: (10 points) 3x - y = 4 12x2 - 3x = y