michelerin9486
04.05.2021 •
Mathematics
Y is directly proportional to x² and y = 50 when x =5, Find
i) Equation connecting x and y
ii) The value of y when x= 4
iii) The value of x when y= 200
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Ответ:
Equation: y = 2(x^2)
Y-value = 32
X-value = 10
Step-by-step explanation:
y = k(x^2)
k symbolises proportionality.
solve for k:
50 = k(5^2)
50 = 25k
k =2
So...
equation is y = 2(x^2)
Value of y when x = 4,
y = 2 x 4^2
y = 2 x16
y = 32
Value of x when y = 200,
200 = 2(x^2)
100 = x^2
x = 10
Ответ: