Algebal review 10 doc

Practice Question

Which of the five points on the graph above has coordinates (x,y) such that x  y 1?

a. A

b. B

c. C

d. D

e. E

Answer

d. You must determine the coordinates of each point and then add them:

A (2,4): 2  (4) 2

B (1,1): 1  1 0

C (2,4): 2  (4) 6

D (3,2): 3  (2) 1

E (4,3): 4  3 7

Point D is the point with coordinates (x,y) such that x  y 1.

Lengths of Horizontal and Vertical Segments

The length of a horizontal or a vertical segment on the coordinate plane can be found by taking the absolute value

of the difference between the two coordinates, which are different for the two points.

A

E

B

D

1

C

1

–GEOMETRY REVIEW–

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