SOLUTION: 1. How do you plot x = 2y, y = x + 2, y = 2x and y = x � 2 on a graph. Which one of the above formulas describes a line.

Question 720757: 1. How do you plot x = 2y, y = x + 2, y = 2x and y = x � 2 on a graph.
Which one of the above formulas describes a line.

Found 2 solutions by josmiceli, MathLover1:
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
They all describe straight lines
To see this, put them all into the
slope-intercept form
(1)
(1)
-----------------
(2) ( don't have to change )
-----------------
(3) ( don't have to change )
-----------------
(4) ( same as (1) )
-----------------
These all have the form ,
where = slope and = y-intercept
For (1) and (3),
------------------
Since 2 are the same, there is only 3 lines:

Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!
, , and .....these are all equations of a line because you have and
to plot them on a graph, all you need is to find two points for each and draw a line through
easiest way is to find and
1.
....to find plug in

....... is at (,)
since will be also at ,), we will find a point for

....... the point is at (,)
now plot points (,) and (,) on a Cartesian coordinate system and draw a line through

2.

....to find plug in

....... is at (,)

....to find plug in

....... is at (,)

3.
....to find plug in

....... is at (,)
since will be also at ,), we will find a point for

....... the point is at (,)
now plot points (,) and (,) on a Cartesian coordinate system and draw a line through

4.
...this is same as 1. when you solve it for

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