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Solve: 3x+y=6 4x-2y=18 show all work !

Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups

Find the distance between (7,-6) and (-3,-9)