Please answer the math problem... I will mark you brainliest

Ineed with number 17 i don’t get it at alll

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?

Choose the correct slope of the line that passes through the points (1, -3) and (3, -5)