A pharmacist needs 400mL of a 13.5% solution of Ascorbic Acid (Vitamin C). He has on hand a supply of 20% solution and a supply of 8% solution. What is the system of equations that can determine the correct amount of each solution to produce the final 13.5% solution required? Mark all
equations needed.

Step-by-step explanation:

thats your  answer

in the attachment.   i didn't see your choices.   the word which means there is choices.

step-by-step explanation:

(x,y)

x tells you how much left or right you go from the origin

y tells you how much down or up you go from the origin

so for example (-3,2), you go left 3 and up twice. i denoted which of the ordered pairs is which in my graph.