SOLUTION: Can someone please help me with this graphing problem? Graph each question labeling at least three points. y=-1x+2 3

Algebra ->  Coordinate-system -> SOLUTION: Can someone please help me with this graphing problem? Graph each question labeling at least three points. y=-1x+2 3      Log On


   

Question 107293: Can someone please help me with this graphing problem? Graph each question labeling at least three points. y=-1x+2
3
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!
y=-1x%2B2
table for three points:
x | y
1 | 1
2 | 0
0 | 2
now graph:
Solved by pluggable solver: Graphing Linear Equations
In order to graph y=-1%2Ax%2B2 we only need to plug in two points to draw the line

So lets plug in some points

Plug in x=-7

y=-1%2A%28-7%29%2B2

y=7%2B2 Multiply

y=9 Add

So here's one point (-7,9)




Now lets find another point

Plug in x=-6

y=-1%2A%28-6%29%2B2

y=6%2B2 Multiply

y=8 Add

So here's another point (-6,8). Add this to our graph





Now draw a line through these points

So this is the graph of y=-1%2Ax%2B2 through the points (-7,9) and (-6,8)


So from the graph we can see that the slope is -1%2F1 (which tells us that in order to go from point to point we have to start at one point and go down -1 units and to the right 1 units to get to the next point), the y-intercept is (0,2)and the x-intercept is (2,0)


We could graph this equation another way. Since b=2 this tells us that the y-intercept (the point where the graph intersects with the y-axis) is (0,2).


So we have one point (0,2)





Now since the slope is -1%2F1, this means that in order to go from point to point we can use the slope to do so. So starting at (0,2), we can go down 1 units



and to the right 1 units to get to our next point


Now draw a line through those points to graph y=-1%2Ax%2B2


So this is the graph of y=-1%2Ax%2B2 through the points (0,2) and (1,1)