or
Matthew loves to bake blueberry muffins for his friends and family.
There is a proportional relationship between the volume of flour Matthew uses (in cups), x, and the number of muffins he bakes, y.
x (cups) y (muffins)
1 4
2 8
3 12
4 16
Write an equation for the relationship between x and y. Simplify any fractions.
y=