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Lisa [10]
3 years ago
8

Help us plazz this is mathematics IGCSE fast as you can​

Mathematics
2 answers:
VladimirAG [237]3 years ago
5 0

Answer:

The value of y is 8.

Step-by-step explanation:

Given that y is directly proportional to √(x+5) so the equation is y = k√(x+5) where k is constant. First, you have to find the value of k with given values :

y = k \sqrt{x + 5}

let \: x =  - 1,y = 4

4 = k \sqrt{ - 1 + 5}

4 = k \sqrt{4}

4 = k(2)

4 \div 2 = k

k = 2

So the equation is y = 2√(x+5). In order to find the value of y, you have to substitute x = 11 into the equation :

y = 2 \sqrt{x + 5}

let \: x = 11

y = 2 \sqrt{11  + 5}

y = 2 \sqrt{16}

y = 2(4)

y = 8

TiliK225 [7]3 years ago
3 0

Answer:

Step-by-step explanation:

y varies direcrtly with √(x+5) wich can be expressed mathematically as:

● y = k*√(x+5)

Let's calculate k khowing that y=4 and x=-1

● 4 = k*√(-1+5)

● 4 = k*√(4)

● 4 = k * 2

● k = 4/2

● k = 2

■■■■■■■■■■■■■■■■■■■■■■■■■■

Let's calculate y khowing that x = 11

● y = k*√(x+5)

● y = 2×√(11+5)

● y = 2× √(16)

● y = 2× 4

● y = 8

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--------------

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