solve the following system of linear equations by elimination. verify your solution.

Question

1. -4x-9y=9 2. x-3y=-6

Answer 1

- 4x-9y=9
+1x-3y=-6 multiply this by -3
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- 4x-9y= 9
-3x+9y=18
======================= now add
- 7 x = 27
x = -27/7
now y
+1x-3y=-6
so 3 y = 6 + x
3 y =42/7 -27/7 = 15/7
y = 5/7
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check
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- 4x-9y=9 ?
-4 (-27/7) - 9 (5/7) = 9 ????
(108 - 45)/7
63/7
9 finest kind !!!