SOLUTION: Solve each system graphically X-y=1 X+y=5 Please show work

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Question 763703: Solve each system graphically
X-y=1
X+y=5
Please show work
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

Solved by pluggable solver: Solve the System of Equations by Graphing



Start with the given system of equations:


1x-y=1

1x%2By=5





In order to graph these equations, we need to solve for y for each equation.




So let's solve for y on the first equation


1x-y=1 Start with the given equation



-y=1-x Subtract +x from both sides



-y=-x%2B1 Rearrange the equation



y=%28-x%2B1%29%2F%28-1%29 Divide both sides by -1



y=%28-1%2F-1%29x%2B%281%29%2F%28-1%29 Break up the fraction



y=x-1 Reduce



Now lets graph y=x-1 (note: if you need help with graphing, check out this solver)



+graph%28+600%2C+600%2C+-10%2C+10%2C+-10%2C+10%2C+x-1%29+ Graph of y=x-1




So let's solve for y on the second equation


1x%2By=5 Start with the given equation



1y=5-x Subtract +x from both sides



1y=-x%2B5 Rearrange the equation



y=%28-x%2B5%29%2F%281%29 Divide both sides by 1



y=%28-1%2F1%29x%2B%285%29%2F%281%29 Break up the fraction



y=-x%2B5 Reduce





Now lets add the graph of y=-x%2B5 to our first plot to get:


+graph%28+600%2C+600%2C+-10%2C+10%2C+-10%2C+10%2C+x-1%2C-x%2B5%29+ Graph of y=x-1(red) and y=-x%2B5(green)


From the graph, we can see that the two lines intersect at the point (3,2) (note: you might have to adjust the window to see the intersection)