SOLUTION: i'am a10TH std school girl, i'am not able to solve this particular sum in linear equations in the cross multiplication method. sum: 2(ax-by)+a+4b=0 2(bx+ay)+b-4a=0

Question 2774: i'am a10TH std school girl, i'am not able to solve this particular sum in linear equations in the cross multiplication method.
sum:
2(ax-by)+a+4b=0
2(bx+ay)+b-4a=0
Answer by longjonsilver(2297) (Show Source): You can put this solution on YOUR website!
you have 2 variables, x and y. You need to make one variable the same in both equations then we can either add or subtract the equations to leave just the other variable.

I will make the x's the same by multiplying the first equation by b and the second equation by a:

--eqn1
--eqn2

Now, as both x-terms have the SSSSSame signs (both positive), we will SSSSSubstract, to give:

2y = 4
y = 2

Now sub this into either eqn1 or eqn2. I will choose eqn1...

so x = -1/2.

jon

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