You get a curve. If you join them along the shortest [Euclidean] distance between them, you get a straight line.
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Take the 4 corners (vertices) of any 4-sided figure (quadrilateral). Draw the quadrilateral and its diagonals.
Division by 0 is not defined so 3x cannot be zero. That is, x cannot be zero. Establish the domain of the graph and select a number of values of x in the range. Calculate y for each of these values. Mark the x and y coordinates on the Cartesian plane and then join these together by a smooth curve. However, ensure that the curve does not join points on either side of x = 0 (for example x = 1- and x = +1).
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To graph the equation y - x + 3, we can first rearrange it into slope-intercept form, y = x - 3. This equation represents a line with a slope of 1 and a y-intercept of -3. To graph it, start by plotting the y-intercept at (0, -3), then use the slope to find another point, such as moving up 1 unit and to the right 1 unit. Connect these points with a straight line to complete the graph.
The x co-ordinate of each point on a vertical line is the same. So pick two points with the same x coordinates and with y-coordinates as far apart as the scale allows and join them.