Question

4x+2y=7 y 4x-3y=-2 ayuda
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Answer 1

Explicación paso a paso:

$4x + 2y = 7 \: \: \: \: \times 3 \\ 12x + 6y = 21 \\ 4x - 3y = - 2 \: \: \: \: \times 2 \\ 8x - 6y = - 4 \\ \\ 12x + 6y = 21 \\ 8x - 6y = - 4 \\ 20x = 17 \\ x = \frac{17}{20}$

$4x + 2y = 7 \\ 4 \times \frac{17}{20} + 2y = 7 \\ \frac{68}{20} + 2y = 7 \\ 2y = 7 - \frac{68}{20} \\ 2y = \frac{140}{20} - \frac{68}{20} \\ 2y = \frac{72}{20} \\ y = \frac{ \frac{72}{20} }{2} = \frac{72}{20} \times \frac{1}{2} = \frac{72}{40} = \frac{36}{20}$

espero te sirva