Question: X

Fsolve solve for numeric when I put X as an parameter in one of the equation it get an error

y1 := 2*a*b^2-b+c-d-1 = X;
y2 := a^4+b^3-b^2+c-d+2 = 0;
y3 := a*b^2-b+c-d-3 = 0;
y4 := a^3*b^2-b+c-d^3+4 = 0;
fsolve({y1, y2, y3, y4},{a,b,c,d})

Error, (in fsolve) X is in the equation, and is not solved for

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