# Y varies directly with √x+5. y = 4 when x = -1. Find y when x = 11?

### 3 Answers

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- alexLv 74 months ago
hint:

y varies directly with √(x + 5)---> y = k√(x + 5)then usey = 4 when x = -1to find the constant k...

- KrishnamurthyLv 74 months ago
y varies directly with √x + 5.

y = 4 when x = -1

y = k(x + 5)^(1/2)

4 = k(-1 + 5)^(1/2)

4 = k(4)^(1/2)

4 = 2k

k = 2

y = 2(x + 5)^(1/2)

y = 8 when x = 11

- stanschimLv 74 months ago
y = k(x + 5)^(1/2)

4 = k(-1 + 5)^(1/2)

4 = k(4)^(1/2)

4 = 2k

k = 2

y = 2(x + 5)^(1/2)

y = 2(11 + 5)^(1/2)

y = 2(16)^(1/2)

y = 2(4) = 8

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