How do you graph # 3x+y=-6#?
1 Answer
May 25, 2016
Change the equation into standard form,
Then either plot points or use the y-intercept and the gradient.
Explanation:
The y-intercept is -6. This is the first obvious point.
To find the x-intercept, make y = 0:
Now solve for x:
These two points are enough,but it is better to have a few more to check.
The gradient is -3. This is better written as
From -6 on the y-axis, count UP 3 units and LEFT 1 unit and mark the point. (-1,3). Repeat this a few times which will give the points
(-2, 0), (-3,3) (-4,6) (-5,9)
These can be joined with a straight line to give the graph.
