1.

\begin{array} { l } { \frac { 57 } { x + y } + \frac { 6 } { x - y } = 5 } \\ { \frac { 38 } { x + y } + \frac { 21 } { x - y } = 9 } \end{array}

Answer»

can I have it using cross multiplication please

solve by substitution method

by using substitution method



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