# Basic Algebra

### Example 1

In which quadrant(s) are both the x and y coordinates the same sign?

### Example 2

If a point has a y coordinate of zero, which axis does it lie on?

### Example 3

Do these points lie in a straight line: (-8, -1), (-6, 1), (-4, 3) and (0, 7)?

### Example 4

What type of quadrilateral do these points form: (-3, 1), (4, 1), (2, -2) and (-5, -2)?