You can put this solution on YOUR website! write
y = -2x in standard form is 2x+y+0=0
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how would you graph it?
Let x=0, then y=-2*0 = 0
Let x=1, then y=-2*-1=-2
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Plot those two points, (0,0) and (1,-2)
and draw a line thru them:
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Cheers,
Stan H.