CBSE Class 10 Answered
linear eqns in 2 variable..
Asked by | 15 Feb, 2010, 11:10: PM
Expert Answer
Use cross multiplication, do it step by step so don't make any mistake.
(a-b)x + (a+b)y = a2 - 2ab - b2
(a+b)x + (a+b)y = a2 + b2
Subtracting the two equations,
(a-b)x - (a+b)x = (a2 - 2ab - b2)-(a2 + b2)
-2bx = -2ab-2b2
x = a+b
Use this in the given equations,
(a+b)x + (a+b)y = a2 + b2
(a+b)(a+b) + (a+b)y = a2 + b2
a2 + 2ab + b2 + (a+b)y = a2 + b2
y = -2ab/(a+b)
Regards,
Team,
TopperLearning.
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