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Baldwin
Mathematics
1 January, 14:06
Solve x-y=2 and x+y=1
+1
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Corbin Webb
1 January, 14:20
0
x - y = 2 / / x + y = 1
Find x in the first equation and substitute it into the second equation.
x = 2 + y ⇒ (2 + y) + y = 1
2 + 2y = 1
2y = - 1
Substitute y into the first equation.
y = - 1/2 ⇒ x - (-1/2) = 2
x = 1 1/2
x = 1 1/2, y = - 1/2
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Dominik Bailey
1 January, 14:20
0
We can use elimination to solve this system of linear equations:
x - y = 2
x + y = 1
Add the equations together to cancel out the y variables:
2x = 3
Divide by 2:
x = 3/2
Use x to solve for y:
3/2 - y = 2
Add y to both sides:
3/2 = y + 2
Subtract 2 rom both sides:
y = - 1/2
So, your answer is x = 3/2 and y = - 1/2.
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