mattgondek4

2021-09-16

Solve, please:

$\{\begin{array}{ccccc}0.7x& -& \frac{1}{2}y& =& 9.4\\ 0.9x& +& \frac{7}{10}y& =& 0\end{array}$

Malena

Skilled2021-09-17Added 83 answers

Multiply equations (1) and (2) by 10.

Multiply equation (3) by 7 and equation (4) by 5.

Add equations.

Substitute

So, the solution is

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