A few days ago
Anonymous

# How do i graph x + y = -2 ???

How do i graph x + y = -2 ???

A few days ago
JB

this is a linear expression and fits the format

y=mx+b

solve for y:

x + y = -2 ==> y = -1x – 2

now choose a few numbers for y (0,1,-1 are best)

and solve for x

y|x

0|

1|

-1|

now graph the chart you’ve made

y|x

0|-2

1|-3

-1|-1

as (0,-2) (1,-3) (-1,-1)

connect the dots and you have your line

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A few days ago
Maverick
first put the equation into slope intercept format (y=mx+b), you can do this by subtracting x from both sides to get

y = -x-2

remember that in this format, m is the slope and b is the y-intercept

so slope is -1 and y-intercept is -2

slope also can be thought as rise over run and the number -1 can also be written as -1/1 (or 1/-1, it makes no difference).

so on your graph, since the y-intercept is -2, (this is where the graph crosses the y-axis), you know that this point is (0.-2). Now, you can do the slope. As stated above, it is rise over run. So, using the slope of -1/1, you go down 1 and to the right 1 for the next point. connect the points for the graph.

Note: if you would have used 1/-1 for slope, you would have gone up 1 and to the left 1 and this point is on the same line!!!!

Good luck

0

A few days ago
NillaWafer
solve for y

y= -x-2 which means y=-1/1x-2 (-1/1 is your slope)

now just slap it on the graph

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