true
true
If it is a straight line through the origin then it represents a direct proportion.
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.
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.
If it is a straight line through the origin then it represents a direct proportion.
The fractions are proportional and their cross products are equal
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.