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Graph y = x + 2

Substitute some values for x and find out y

If x = 0 then y = 2 (x, y) = (0, 2)

If x = 1 then y = 3 (x, y) = (1, 3)

If x = -1 then y = 1 (x, y) = (-1, 1)

Plot the points (x, y) in the graph and draw line connecting all the points

the above is the graph of linear equation y = x + 2

Graph equation y = -2x -1

y = - 2x – 1

If x = 0 then the value of y = -1 so (x, y) = (0, -1)

If x = 1 then the value of y = -3 so (x, y) = (1, -3)

By taking some more values of x find values of y

By plotting x, y values in the graph and draw line connecting all the points

The above examples show the way of graphing linear equation.