How do you graph the equation x=3 on a x,y graph?
Also how do you graph f(x)=-3x + 2 on the same graph?
The x,y graph of some condition or expression is the collection of points (x,y) that satisfy the condition.
|In your first question the graph is the collection of points, (x,y) that satisfy x=3, that is the set of points of the form (3,y). Since there is no condition that restricts y it can be any number and the graph is the vertical line three units to the right of the Y-axis.|
In your second problem, f(x) = -3x + 2 or y = -3x + 2, the graph is the set of points (x,y) that satisfy y = -3x + 2, i.e. the set of points of the form (x,-3x + 2). To plot graph you might construct a table of values and then plot the points.
Joining these points, which lie on a line, and putting the two graphs together you get
I hope this helps
Harley and Maxine
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