true
true
Multiply the cross products, and see if they are equal. If they are equal, the proportion is true. If they are unequal, the proportion is false.
If it is a straight line through the origin then it represents a direct proportion.
true
It is finding all the solutions of a proportional relationship.
true
True.
By observing the proportion of affected offspring and whether males or females are more affected.
If the points lie on a straight line through the origin, the two variables are in direct proportion.
true
true
true
There cannot be a "proportion of something": proportion is a relationship between two things, and how you solve it depends on whether they (or their transformations) are in direct proportion or inverse proportion.
The factors that determine whether a product has elastic, inelastic, or unit-elastic demand in the market include the availability of substitutes, the necessity of the product, the proportion of income spent on the product, and the time frame considered.
Multiply the cross products, and see if they are equal. If they are equal, the proportion is true. If they are unequal, the proportion is false.
If it is a straight line through the origin then it represents a direct proportion.