I am writing a computer program to solve a physical problem which at some part involves the following two equations and two unknowns;
(1) \[ C_1(x^4-y^4) + C_2x = Q_1 \]
(2) \[ C_1(y^4-x^4) + C_3y = Q_2 \]
C1, C2 & C3 are coefficients which can readily be calculated and do not rely on knowing...