Answer:
3
−
9
=
−
3
9
3
−
6
=
-21
Step-by-step explanation:
3x−9y=−39, 3x−6y=−21 : x=5, y=6
Steps
[ 3x−9y=−39 3x−6y=−21 ]
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Isolate x for 3x−9y=−39: x=−13+3y
Substitute x=−13+3y
[ 3(−13+3y)−6y=−21 ]
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Simplify
[ −39+3y=−21 ]
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Isolate y for −39+3y=−21: y=6
For x=−13+3y
Substitute y=6
x=−13+3· 6
Simplify
x=5
The solutions to the system of equations are:
