Question 141296
Example 
y = 3x + 2
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The slope is the coefficient of x; the slope = 3
That means "as x increases 1, y increases 3".
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The y-intercept is 2 or the point (0,2).
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Graphing:
Plot a point at (0,2)
From that point move your pencil 1 to the right, then three up, and 
put another point.  Draw a line thru the wo points.
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{{{graph(400,300,-10,10,-10,10,3x+2)}}}
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Cheers,
Stan H.