x^2 + 5xy + 4y^2 = 55
x^2 + 7xy + 12y^2 = 99
solve for x and y
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Step-by-step explanation:
Example 1
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Add: 7xy + 5yz - 3zx, 4yz +9zx - 4y, - 3xz + 5x - 2xy.
Expressions are
7xy + 5yz - 3zx
4yz + 9zx - 4y
- 3xz + 5x - 2xy
We put like terms below like terms
7xy + 5yz - 3zx
+ 4yz + 9zx - 4y
-
3zx
- 2xy
5xy + 9yz +
+ 5x
3zx 4y + 5x
So, required sum = 5xy + 9yz + 3zx - 4y + 5x
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