How do you know a relation is a function?

1.) A function can't have any repeated x-coordinates

For example:

{(3, 4), (3, 6), (5, 4)}

This is not a function because 3 is repeated.

{(2, 1) (4, 1), (5, 1)}

This is a function because the y-coordinates can be the same, but not the x-coordinates.

2.) When a function is graphed, it will only have one intersection point with a vertical line.

For examples, see the image attached.

answer: 2x + 2 − 2 = 10 − 2; subtraction property of equality

step-by-step explanation:

according to this law, when unemployment goes up by 1%, gdp drops by 2%. in the question, unemployment rate goes from 2% to 5%, meaning unemployment goes up by 3%, so the gdp drops by 6%. thus the effect is a drop in gdp by 6%.

step-by-step explanation: