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4 x y - 5 Y Z - 3 x 2
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X = 3 and Y = 2. Here is how we find this.
What we have to do is use the first equation to get a value for y. This is quite easy because all we must do is say
x + y = 5 so y = 5 -x
Now we plug that value into the second equation.
2x - (5-x) = 4
This becomes
2x - 5 + x = 4 (because you are subtracting negative x, you are in effect adding x)
3x - 5 = 4
3x = 9
x = 3
If x = 3, then 3 + y = 5 and y = 2
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