Asked by April Preston
Please help with these 3 questions.
1. Suppose that y varies inversely with x, and y=3, when x=5. What is an equation fpr the inverse variation.
2. What are the solutions to the system?
y=x^2+2x-45
y=-3x+5
3. -sqrt 18 divided by sqrt 12
Thank you!
1. Suppose that y varies inversely with x, and y=3, when x=5. What is an equation fpr the inverse variation.
2. What are the solutions to the system?
y=x^2+2x-45
y=-3x+5
3. -sqrt 18 divided by sqrt 12
Thank you!
Answers
Answered by
Scott
1. xy = 15
2. substituting
... -3x + 5 = x^2 + 2x - 45
... 0 = x^2 + 5x - 50
... factoring ... 0 = (x + 10)(x - 5)
... x = -10 , x = 5
substitute the x-values back to find the corresponding y-values
3. -√(18/12) = ±√(3/2)
2. substituting
... -3x + 5 = x^2 + 2x - 45
... 0 = x^2 + 5x - 50
... factoring ... 0 = (x + 10)(x - 5)
... x = -10 , x = 5
substitute the x-values back to find the corresponding y-values
3. -√(18/12) = ±√(3/2)
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