Mathematics: Solve by elimination.x + 2y = 73x - 2y = -3

Solve by elimination.x + 2y = 73x - 2y = -3 - id273231763747, lexidecker243

Ответ:

chynahbug5676

30.12.2021

$+\left\{\begin{array}{ccc}x+2y=7\\3x-2y=-3\end{array}\right\\---------\\x+3x=7+(-3)\\4x=4\ \ \ \ /:4\\x=1\\\\\left\{\begin{array}{ccc}x=1\\x+2y=7\end{array}\right\\\left\{\begin{array}{ccc}x=1\\1+2y=7&/-1\end{array}\right\\\left\{\begin{array}{ccc}x=1\\2y=6&/:2\end{array}\right\\\left\{\begin{array}{ccc}x=1\\y=3\end{array}\right\\$

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Ответ:

mrens8

28.10.2021

Mathematics

H=how far up from the ground does the ladder touch the building
h/30=sin 25°
h=30 sin 25°
h=12.7 decimeters(1 decimal place)
The height that the ladder touch the building far up from the ground is 12.7 decimeters.

Aladder 30 decimeters long is leaning against the side of a building. the ladder makes an angle of 2

Aladder 30 decimeters long is leaning against the side of a building. the ladder makes an angle of 2

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Solve by elimination.
x + 2y = 7
3x - 2y = -3

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