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Solve the system by using the combination method 4x+9y=7 4x-9y=9
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Solve the system by using the combination method
4x+9y=7
4x-9y=9

User Wilsonfoz
by
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1 Answer

4 votes
The two original functions are 4x+9y=7 and 4x-9y=9
To use the combination method, add all the values of the two equations together to cancel out one of the variables
4x+4x+9y-9y=7+9
8x=16
8x/8=16/8
x=2
4(2)+9y=7
8+9y=7
8-8+9y=7-8
9y=-1
y=-
(1)/(9)
User HummingBird
by
8.5k points
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