Question

(d)
If y is directly proportional to 1/xand x = 2 when y = 20, what is the value of
x when y = 1.25? ​

Answer 1

Answer:

x = 32 when y = 1.25

Step-by-step explanation:

As stated above

$y \alpha \frac{1}{x}$

replacing the proportionality sign with equality and a constant

$y = \frac{k}{x}$

putting the values of x and y to find k

$y \times x = k$

thus

$k = 2 \times 20 = 40$

NOW when y = 1.25

$x = \frac{k}{y} = \frac{40}{1.25 } = 32$