Question

F is directly proportional to x. when F is 6,x is 4. find the value of F when x is 5​

Answer 1

$\huge\mathfrak\red{Answer}$

$f \: ∝ \: x \\ f = kx \\ when \: f = 6 \: and \: x = 4 \\ 6 = k(4) \\ k = \frac{6}{4} = \frac{3}{2}$

$when \: x = 5 \\ f = \frac{3}{2} \times 5 \\ f = \frac{15}{2}$