Question

given 4x^2-y^2=171 and 2x-y=9, solve simultaneously

Answer 1

Answer:

it is part of the answer

Step-by-step explanation:

• 4x² - y² = 171
• 2x - y = 9

• 2x - y = 9 ⇒ (2x - y)² = 9² ⇒ 4x² - 4xy - y² = 81 ⇒ (4x² - y²) - 4xy = 81 ⇒

171 - 4xy = 81 ⇒ 4xy = 90 ⇒ y = 22.5/x