Question 140674
To solve the equation graphically, notice that it is made up of two functions, y=4x-1 and y=3x+15. 
The solution is at the intersection of these two lines. 
Be sure to show the intersection on the graph. 
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Graph y = 4x-1 by finding two points:
If x = 0, y = -1
If x = 1, y = 3
Plot the points (0,-1) and (1,3)
Draw a line thru them to see the graph of y = 4x-1
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Graph y = 3x+15 by finding two points:
If x = 0, y = 15
If x = 1 y = 18
Plot the points (0,15) and (1,18)
Draw a line thru them to see the graph of y = 3x+15
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{{{graph(400,300,-10,40,-10,80,4x-1,3x+15)}}}
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cheers,
Stan H.