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How would you solve 2x plus 5y equals -1 and x plus 2y equals 0?
Wiki User
∙ 12y ago
A system?
2X + 5Y = - 1
- 2(X + 2Y = 0)
use multiplicative elimination; shown above
2X + 5Y = - 1
- 2X + - 4Y = 0
-----------------------add
Y = - 1
----------------now find X, bottom original ( X + 2Y = 0 ) equation will do
X + 2(- 1) = 0
X - 2 = 0
X = 2
----------------check in both original equations
2(2) + 5(- 1) = - 1
4 - 5 = - 1
- 1 = - 1
----------------top checks
(2) + 2(- 1) = 0
2 - 2 = 0
0 = 0
--------------both check and this system is consistent, (2, - 1) is the answer set
Wiki User
∙ 12y ago
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