if 8x^2+y^2-12x-4xy+9find 14x-5y
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14x - 5y = 6 if 8x² + y² - 12x - 4xy + 9 = 0
Step-by-step explanation:
8x² + y² - 12x - 4xy + 9 = 0
=> 4x² + 4x² + y² - 12x - 4xy + 9 =0
=> 4x² + y² - 4xy + 4x² -12x + 9 = 0
=> (2x - y)² + (2x - 3)² = 0
=> 2x - 3 = 0
=> x = 3/2
2x - y = 0
=> y = 2x
=> y = 2 * 3/2
=> y = 3
14x - 5y
= 14 * (3/2) - 5(3)
= 21 - 15
= 6
14x - 5y = 6
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