Practice!

Sample Problem

Solve the following linear system

-2x – 5y = 9

3x + 11y = 4

x = y =

Solution

(-2x – 5y = 9) × 3 → -6x – 15y = 27

(3x + 11y = 4) × 2 → 6x + 22y = 8

-6x – 15y = 27

6x + 22y = 8

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7y = 35

y = 5

-2x – 5(5) = 9

-2x = 34

x = -17