Question

П Розв'язати систему способом
підстановки:
(3x+4y=-2
2x-7y = 6

Answer 1

Ответ на фотографии

Answer 2

$\displaystyle\bf\\\left \{ {{3x+4y=-2} \atop {2x-7y=6} \ |:2} \right. \\\\\\\left \{ {{3x+4y=-2} \atop {x-3,5y=3}} \right. \\\\\\\left \{ {{3\cdot(3,5y+3)+4y=-2} \atop {x=3,5y+3}} \right. \\\\\\\left \{ {{10,5y+9+4y=-2} \atop {x=3,5y+3}} \right.\\\\\\\left \{ {{14,5y=-11} \atop {x=3,5y+3}} \right. \\\\\\\left \{ {{y=-\dfrac{22}{29} } \atop {x=3,5\cdot(-\dfrac{22}{29} )+3}} \right. \\\\\\\left \{ {{y=-\dfrac{22}{29} } \atop {x=-2\dfrac{19}{29} }+3} \right.$

$\displaystyle\bf\\\left \{ {{y=-\dfrac{22}{29} } \atop {x=\dfrac{10}{29} }} \right. \\\\\\Otvet: \ \Big(\frac{10}{29} \ ; \ -\frac{22}{29} \Big)$