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What two criteria are needed for triangles to be similar

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12