A photo would be nice...
The result is a straight line on an X/Y graph. It passes through the coordinate X=0, Y=1 and then through X=1, Y=4.
You can plot points on the line by substituting values for X and solving the equation for Y. For example:
At X=0... Y = 3*0 + 1 = 1
At X=1... Y = 3*1 + 1 = 4
At X=2... Y = 3*2 + 1 = 7
etc...
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The lines are parallel.
3x + y = -1 y = -3x - 1 The graph is a straight line, with a slope of -3, passing through the point Y = -1 on the y-axis.
(2, -1)
y = 3x + 1
y = 3X - 1