Решите систему уравнений, методом подстановки. А ) х=5у-6 3х-4у=4 Б)

Ответы 1

A. $\left \{ {{x=5y-6} \atop {3x-4y=4}} ight. \\ \\ \left \{ {{x=5y-6} \atop {3\cdot (5y-6)-4y=4}} ight. \\ \\ \left \{ {{x=5y-6} \atop {15y-18-4y=4}} ight. \\ \\ \left \{ {{x=5y-6} \atop {11y=22}} ight. \\ \\ \left \{ {{x=10-6} \atop {y=2}} ight. \\ \\ \left \{ {{x=4} \atop {y=2}} ight.$ Б. $\left \{ {{4x-5y=-2} \atop {3x+2y=-13}} ight. \\ \\ \left \{ {{4x-5y=-2} \atop {y= \frac{ -13-3x}{2}}} ight. \\ \\ \left \{ {{4x-5\cdot( \frac{ -13-3x}{2}) =-2} \atop {y= \frac{ -13-3x}{2}}} ight. \\ \\ \left \{ {{8x-5\cdot( -13-3x) =-4} \atop {y= \frac{ -13-3x}{2}}} ight. \\ \\ \left \{ {{8x+65+15x) =-4} \atop {y= \frac{ -13-3x}{2}}} ight. \\ \\ \left \{ {{23x=69} \atop {y= \frac{ -13-3x}{2}}} ight. \\ \\ \left \{ {{x=3} \atop {y= \frac{ -13-3\cdot 3}{2}}} ight. \\ \\$ $\left \{ {{x=3} \atop {y= \frac{ -24}{2}}} ight. \\ \\ \left \{ {{x=3} \atop {y= -12}} ight. \\ \\$
- Автор:
  jet
- 5 лет назад
- 0
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