These steepness (called the slope) of the two lines are controlled by the sliders below. What would happen to the lines if the sliders had the same value?

Hint: pay attention to the value labels on the sliders; even if the sliders are in the same position, they may not correspond to the same value.

In the equation $y=kx$, any change to the value of $x$ results in a change to the value of $y$.

If adding $3$ to $x$ results in $y$ growing by $12$, what is the value of $k$?

**Is it possible to make every line shown above in the format $y = mx + b ?$**