A proportional relationship is given by the form:
[tex]y=kx \\ \\ \\ Where: \\ \\ \text{k is a constant}[/tex]
So this represents a line that passes through the origin. Let's see the table that shows a proportional relationship:
[tex]\begin{array}{cc}x & y\\0 & 0\\1 & 1.4\\2 & 2.8\\3 & 4.2\\4 & 5.6\end{array}[/tex]
So the slope of this line is the k-value that can be found as:
[tex]k=\frac{1.4}{1} \\ \\ \boxed{k=1.4}[/tex]
