Elisa is writing an algebraic experession for the phrase 5 less than a number. findher mistake and correct it.

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!