TEKS 8(1)(D), 8(4)(B), 8(5)(A), 8(5)(F)
Proportional relationships can be shown using tables, graphs, and equations. Each model below shows a proportional relationship where y is twice x.
Table A table shows a proportional relationship when one quantity is a constant multiple of the other quantity.
Graph A graph shows points with a proportional relationship if a line that passes through the origin can be drawn through the points. For each point, the y-coordinate is a constant multiple of the x-coordinate.
Equation Equations in the form y = mx represent proportional relationships. In the equation, m is the constant of proportionality, or the constant multiple y over x . Sometimes a k is used to represent the constant of proportionality. So an equation in the form y = kx is the same as an equation in the form y = mx.
The equation of the line is y = 2x.