Troyb0y
Troyb0y Troyb0y
  • 02-07-2017
  • Mathematics
contestada

2x + y = 5
x + y = 4

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royalranger
royalranger royalranger
  • 02-07-2017
2x + y = 5 and x + y = 4

If you need to find x and y, then you can rearrange the equations like so:

x = 4 - y 
lets plug this into the first equation:
2(4 - y) + y = 5
8 - 2y + y = 5
8 - 1y = 5
-1y = -3
y = 3

So now that we have y, we can plug it into either equation to get x:
x  + 3 = 4
x = 1
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