<em>y</em><em>=</em><em>2</em><em>x</em> The "formula" would be <em>y</em><em>=</em><em>m</em><em>x</em><em>+</em><em>b</em> where <em>m</em> is the slope and b is the y-intercept. in this case, the slope is 2 and the y-intercept is 0 therefore the equation is <em>y</em><em>=</em><em>2</em><em>x</em> (no zero because we can atoumtucally assume that its a zero)