Mathematics: 3x+8y=-1 -3x+y=-17 solve with addition method and get the points for x and y

3x+8y=-1 -3x+y=-17 solve with addition method and

Ответ:

jstephanie644

02.01.2022

$3x+8y=-1 \\
\underline{-3x+y=-17} \\
8y+y=-1-17 \\
9y=-18 \\
y=\frac{-18}{9} \\
y=-2 \\ \\
-3x+y=-17 \\
-3x-2=-17 \\
-3x=-17+2 \\
-3x=-15 \\
x=\frac{-15}{-3} \\
x=5 \\ \\
\boxed{(x,y)=(5,-2)}$

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Ответ:

fruitasticgabs8175

02.01.2022

Mathematics

$\left \{ {{3x+8y=-1} \atop {-3x+y=-14}} \right. \\+-------\\add\ both\ equations\\\\
9y=-15 \ \ \ | divide\ by\ 9\\\\
y=-\frac{15}{9}=-\frac{5}{3}\\\\
3x=-1-8y\ \ \| divide\ by\ 3\\\\
x=\frac{-1-8y}{3}=\frac{-1-8*(-\frac{5}{3})}{3}=\frac{-1+\frac{40}{3}}{3}=\frac{37}{3}*\frac{1}{3}=\frac{37}{3}$

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Ответ:

tatiiiee

06.02.2020

Mathematics

The notation represents the compound inequality in interval notation is:

Option A. x ∈ [ -5, 1)

Step-by-step explanation:

x >_ -5 and x < 1

In interval notation:

x >_ -5: x ∈ [ -5, infinity)

x < 1: x ∈ ( -infinity, 1)

x >_ -5 and x < 1

[ -5, infinity) ∩ ( -infinity, 1)

x ∈ [ -5, 1)

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3x+8y=-1
-3x+y=-17
solve with addition method and get the points for x and y

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