You can put this solution on YOUR website! Plug in x, solve for y and see if it matches.
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Using y = 3x - 1
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y = 3(4) - 1 = 12 - 1 = 11 : (4,11) match
y = 3(7) - 1 = 21 - 1 = 20 : (7,20) no match
y = 3(17) - 1 = 51 - 1 = 50: (17,50) no match
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