You can put this solution on YOUR website! you can use any graphing calculator
OR
Plot the points and draw the line
x-y=3
y=x-3
Get y values from different values of x
For
x=1 , y= -2 (1,-2)
x=3 , y=0 (3,0)
x=-3, y=-6 (-3,-6)
Plot the points and draw the line
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