Direct & Inverse proportion

Direct & Inverse proportion

Tips & Tricks

Direct proportion

y=kx

Inverse proportion

y=ᵏ⁄ₓ

(Direct proportion) y=kx.

When y is doubled,

x will be doubled.

(Direct proportion) y=kx.

When x is doubled,

y will be doubled.

(Direct proportion) y=kx.

When x is halved,

y will be halved.

(Direct proportion) y=kx².

When x is doubled (x2),

y will be quadrupled (x4).

(Direct proportion) y=kx².

When x is halved (x½),

y will be quartered (x¼).

(Direct proportion) y=kx².

When x is tripled (x3),

y will be increase by a factor of 9 (x9).

(Direct proportion) y=kx².

When y is quadrupled (x4),

x will be only doubled (x2).

(Direct proportion) y=k $\sqrt{x}$  .
When x is quadrupled (x4),

y will be only doubled (x2).