Question 272173
x = price of a case of water
y = price of a case of juice
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6x = 135  :: 6 cases of water cost $135
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4y + 2x = 110  :: 4 cases of juice + 2 cases of water cost $110
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So, there you have 2 equations using x and y.
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Of course, solving this is now straightforward.
x = 135/6 = 22.50
4y + 2(22.50) = 110
4y = 110 -45 = 65
y = 65/4 = 16.25
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Done