You can put this solution on YOUR website! To check, just plug in the (x, y) = (1,-7) values to see if the equation holds:
When writing I like to put a question mark above the equal sign, but here I will use =?=
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-7 =?= 5(1) - 7
-7 =?= -2
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NO (1, -7) does not make the equation true!
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I hope you now understand how to do these.