ฟังก์ชันเชิงเส้น (linear function)

$$f\left(x\right)=x^2-3$$

$$f\left(x\right)=3x-2$$

$$f\left(x\right)=\frac{4}{x}$$

$$f\left(x\right)=\sqrt[]{x}+1$$

$$\left(-9,0\right)$$

$$\left(0,-9\right)$$

$$\left(0,4\right)$$

$$\left(4,0\right)$$

$$f\left(x\right)=-x+1$$

$$f\left(x\right)=4x+3$$

$$f\left(x\right)=2x-6$$

$$f\left(x\right)=3x-2$$

$$f\left(x\right)=3x$$

$$f\left(x\right)=2x+1$$

$$f\left(x\right)=x+2$$

$$f\left(x\right)=5x-1$$

$$f\left(x\right)=x+5$$

$$f\left(x\right)=4x+1$$

$$f\left(x\right)=-3x$$

$$f\left(x\right)=2x-2$$

$$f\left(x\right)=2x-2$$

$$f\left(x\right)=-2x+2$$

$$f\left(x\right)=2x-5$$

$$f\left(x\right)=-2x+5$$