10
Step-by-step explanation:
let y=kx, k is constant
when y=6, x=15
6=k x 15
k=0.4
when x=25,
y= 0.4 x 25
y=10
Answer:
y = 10
Step-by-step explanation:
Given that y varies directly as x then the equation relating them is
y = kx ← k is the constant of variation
To find k use the condition y = 6 when x = 15, thus
6 = 15k ( divide both sides by 15 )
k = [tex]\frac{6}{15}[/tex] = [tex]\frac{2}{5}[/tex]
y = [tex]\frac{2}{5}[/tex] x ← equation of variation
When x = 25, then
y = [tex]\frac{2}{5}[/tex] × 25 = 10
