Solving Systems by Elimination

One Variable

100

x - 2 = 8

x + 2 = 12

x = 10

200

2y - 12 = -6

y + 12 = 15

y = 3

300

19p - 8.2 = 67.8

-8p + 8.2 = -23.8

p = 4

400

43n + 100 = -115

-15n - 100 = -25

n = -5

500

17s + 45 = -21.3

17s - 45 = -111.3

s = -3.9

Two Variables

100

x + y = 13

x - y = 7

(10, 3)

200

2y - x = -2

3y + x = 27

(12, 5)

300

2x + 4y = 68

-2x + 3y = 9

(12, 11)

400

What is Ms. Johnson's new grandbaby's name?

Harlan

500

When is the final in Algebra?

tomorrow