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Q) 2x + 3y = 13; 4x + 5y = 23?
Ans: Now take LHS of both the equations and cross multiply and subtract. We get 3*4-5*2 = 2. Let it be 'a'.
Now to find x neglect the x terms and cross multiply the other terms,find the difference and divide the whole term by 'a'.
i.e, x=(3*23-5*13)/a = (69-65)/2 =4/2 =2; y=(13*4-23*2)/a = (52-46)/2 =6/2 =3.
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