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2 votes
(4) 2x +9y=-13
-2x - 8y= 10

User Huantao
by
4.7k points

1 Answer

7 votes

Answer:

x = 7 , y = -3

Explanation:

Solve the following system:

{2 x + 9 y = -13 | (equation 1)

-2 x - 8 y = 10 | (equation 2)

Add equation 1 to equation 2:

{2 x + 9 y = -13 | (equation 1)

0 x+y = -3 | (equation 2)

Subtract 9 × (equation 2) from equation 1:

{2 x+0 y = 14 | (equation 1)

0 x+y = -3 | (equation 2)

Divide equation 1 by 2:

{x+0 y = 7 | (equation 1)

0 x+y = -3 | (equation 2)

Collect results:

Answer: {x = 7 , y = -3

User Darda
by
4.5k points