Randomly choosing a student from a class consisting of 20 boys and 10 girls, and randomly choosing a student from another class consisting of 10 boys
and 20 girls

graph b

step-by-step explanation:

one solution- graph a (clear intercepting point.)

no solution- graph b (they're parallel, there will never be a point of interception.)

infinite solutions- graph c (all points intercept.)

if you're trying to figure out how much each ounce cost it would be 0.20

cents each ounce

a 90 degree rotation across the the origin followed by a reflection across the x-axis.

step-by-step explanation: