Identify two quantities that are proportional
Write the relationship as y = kx
Use a known pair of values for x and y
Divide y by x to find k
Check that the ratio y/x is the same for other pairs
Use the constant k in the equation y = kx
Identify two quantities that are proportional
Write the relationship as y = kx
Use a known pair of values for x and y
Divide y by x to find k
Check that the ratio y/x is the same for other pairs
Use the constant k in the equation y = kx