## Two Equations Two Unknowns! Three Equations Three Unknowns!

 This solves Two Equations and Two Unknowns! Enter the Numbers - Click the Button! Enter => X Y = Enter => X Y = Y = X = This solves Three Equations and Three Unknowns! Enter the Numbers - Click the Button! Enter => X Y Z = Enter => X Y Z = Enter => X Y Z = Z = Y = X = Four Equations and Four Unknowns! Enter => X Y Z K = Enter => X Y Z K = Enter => X Y Z K = Enter => X Y Z K = X = Y = Z = K = Example Finance Problem: Mrs. Johnson would like to invest her savings = \$20,500 in government Bonds paying 5.5% and Stocks which are expected to pay 8% If she would like to get an income from her investment of \$120 per month, How much should she invest in Stocks and how much should she invest in Bonds? Let X = Amount to invest in Bonds Let y = Amount to invest in Stocks => X + Y = 20500 = Total Amount Invested Also => .055*X + .08*Y = 120*12 = 1440 = Yearly Income Type these numbers into the Two Equations above! X = \$8,000 = Bonds Y = \$12,500 = Stocks