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How do you solve the following simultaneous equations by elimination 3x-2y equals 11 and X plus 2y equals 9?
Wiki User
∙ 12y ago
All you need to do on these is make the coefficient(number) of either variable the same, usually by multiplication, then add or subtract to eliminate that variable.
Using Y
As the coefficients of Y are the same, just add the equations:
3x - 2y = 11
x + 2y = 9
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4x + 0y = 20
4x = 20 , which means X = 5 and Y =2
Using X
3x - 2y = 11
x + 2y = 9
Multiply the second equation by 3 and subtract.
x + 2y = 9 becomes 3x + 6y = 27, and it is easiest to just subtract the first
3x + 6y = 27
- (3x - 2y = 11)
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0x +8y = 16
8y = 16 so Y = 2 and X = 5
Wiki User
∙ 12y ago
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