which one of these equations is a nnon proportional relationship-
y=-15x
y=2/3x
y=10x+10
y=4.08x
A non-proportional relationship is one in which the ratio between y and x is not constant.
Out of the given equations, the non-proportional relationship is y=10x+10. In this equation, y is not proportional to x because there is an additional constant term (+10) that is being added to the multiple of x. This indicates that the relationship between y and x is not purely proportional.