Question

for a direct variation describe how the constant of variation affects whether y increases or decreases as x increases

Answer 1

Equation I
y=5/2x is indirect variation b'cos as the value of x increases, the value of y decreases and vice versa

let us substitue x=5, then we get
y=5/2(5)
y=1/2 ==> 0.5

let us substitute x=10, we now get
y=5/2(10) => 1/4 => 0.25

Equation II
y=x+4

this is direct variation cos as you increase the value of x, the value of y wud also increase and vice versa

let us substitute different values for x
let x be 7
y=7+4
y = 11

let x be 2
y=2+4
y=6

thus this is direct variation

Equation III
y=4... this is neither cos there is no x..