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Solve the following system of equations by the method of cross-multiplication:
$\frac{x}{a}\ =\ \frac{y}{b}$
$ax\ +\ by\ =\ a^2\ +\ b^2$
Given: The system of equation given to us is $\frac{x}{a}\ =\ \frac{y}{b}$ ; $ax\ +\ by\ =\ a^2\ +\ b^2$
To do: Solve the given system of equations by the method of cross-multiplication
Solution: The system of equation can be written as
$\frac{x}{a}\ =\ \frac{y}{b}$ ---1)
$ax\ +\ by\ =\ a^2\ +\ b^2$---2)
Multiply equation 1) by b
$\frac{bx}{a}\ =\ \frac{by}{b}$
$\frac{bx}{a}\ =y$ ---3)
Put the value of $y$ in 2)
$ax +b\frac{bx}{a} =a^2 +b^2$
$\frac{a^2x+b^2x}{a}=a^2+b^2$
$\frac{x(a^2+b^2)}{a}=a^2+b^2$
$x(a^2+b^2)=(a^2+b^2)a$
$x=\frac{(a^2+b^2)a}{a^2+b^2}$
$x=a$
Now put the value of $x$ in 3)
$\frac{bx}{a}\ =y$
$\frac{ba}{a}\ =y$
$y=b$
Therefore, the valueof $x$and $y$ is $a$ and $b$ respectively.