Question

29x-21y=79and 21x-29y=71​

Answer 1

Answer:

$\:y=-1$ $x=2$

Step-by-step explanation:

$\begin{bmatrix}21x-29y=71\\ 29x-21y=79\end{bmatrix}$

Equalising both equations:

$29\cdot \frac{71+29y}{21}-21y=79$

$x=\frac{71+29\left(-1\right)}{21}$

$x=2$

Substitute x=2 in any equation and you would get:

$\:y=-1$

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