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Solve the following system of equations using elimination: x + y = 6 -x + 7y = 2
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We have to solve the following system of equations using elimination:
x + y = 6 ...(1)
-x + 7y = 2 ...(2)
First let's eliminate x
Add (1) and (2)
=> 8y = 8
=> y = 1
Now let's eliminate y
7*(1) - (2)
=> 7x + 7y + x - 7y = 42 - 2
=> 8x = 40
=> x = 5
The solution of the system of equations is x = 5 and y = 1
Posted by justaguide on November 18, 2011 at 1:49 AM (Answer #1)
Best answer as selected by question asker.
Using elimination method:
Equations are : x+y=6 ..... (1)
Adding equation (1) & (2) we get ...
As we can see, the x and -x cancelled out, therefore eliminating the variable x, leaving an equation with only one variable (y), able to be solved.
Now that we have a value for y, we must find one for x. To do this, just substitute the value for y into either original equation, and solve it for x
So, now putting the value for y (y=1) into equation (1)
x + 1=6
Solution for these two equations is x=5 & y=1.
Posted by jobaida on November 18, 2011 at 3:15 PM (Answer #2)
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