Le lundi 13 août 2018 19:12:11 UTC+2, Dominique Laurain a écrit :
>
> One line answer :
>
> a,b,x,y = var('a,b,x,y') ; solve([ x + y == a, x - 2*y == b
> ],x,y,dontsolve='a,b')
>
You don't even need that. Just specify that you want to solve for x and y :
sage: var("x,y,a,b")
(x, y, a, b)
sage: solve([x+y==a,x-2*y==b],[x,y])
[[x == 2/3*a + 1/3*b, y == 1/3*a - 1/3*b]]
HTH,
> First statement is to declare symbolic vars a,b,x,y and second statement
> is for solving in symbolics x,y
>
> Dominique
>
> PS : use asksagemath.org
>
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