Question

If X =3 calculae the value of x3 add x

Answer 1

First, we can see that all points seem to be on a line. If it is true, we can find the equation using any two point.

The equation of a line is:

`y=ax+b`

So we got to find a and b. Using the point (0,0), we got:

`\begin{gathered} 0=a\cdot0+b=b \\ b=0 \end{gathered}`

Now we pick another one, let's pick (20,10):

`\begin{gathered} 10=a\cdot20 \\ a=(10)/(20)=(1)/(2) \end{gathered}`

So the equation is:

`y=(1)/(2)x`

Now we can tet all other points to see if it works.

`\begin{gathered} y=(1)/(2)40=20\text{ ok} \\ y=(1)/(2)60=30\text{ ok} \\ y=(1)/(2)100=50\text{ ok} \end{gathered}`

So, the alternative is B.