Question

a. (44– 3y = 12 | x-y=4 método de igualación plis ayuda​

Answer 1

Explicación paso a paso:

$4x + 3y = 12 \\ 4x = 12 - 3y \\ x = \frac{12 - 3y}{4} \\ \\ x - y = 4 \\ x = 4 + y \\ \\ \frac{12 - 3y}{4} = 4 + y \\ 12 - 3y = 16 + 4y \\ - 12 + 16 = - 3y - 4y \\ 4 = - 7y \\ 7y = - 4 \\ y = \frac{ - 4}{7}$

$x = 4 + y \\ x = 4 + \frac{ - 4}{7} \\ = \frac{28}{7} + \frac{ - 4}{7} = \frac{24}{7 } \\ x = \frac{24}{7}$

$\frac{24}{7} - \frac{ - 4}{7} = \frac{28}{7} = 4$

$4 \times \frac{24}{7} + 3 \times \frac{ - 4}{7} = \frac{96}{7} + \frac{ - 12}{7} = \frac{84}{7} = 14$

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