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Mathematics
Lola
3 September, 15:49
Solve.
x^2+y^2=9
2z^2-y^2=6
+1
Answers (
1
)
Patricia Hardy
3 September, 16:46
0
1x² + 1y² = 9
2x² - 1y² = 6
3x² = 15
3 3
x² = 5
x ≈ 2.236
2 (2.236) ² - 1y² = 6
2 (5) - 1y² = 6
10 - 1y² = 6
-10 - 10
-1y² = - 4
-1 - 1
y² = 4
y = 2
(x, y) = (2.236,2)
(x², y²) = (5, 4)
x² + y² = 9
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