Mathematics: Solve the equation with substitution 3x-2y=9 y=2x-7

Solve the equation with substitution 3x-2y=9

Ответ:

kaperry

03.01.2022

$3x-2y=9 \\
y=2x-7 \\ \\
\hbox{substitute 2x-7 for y in the 1st equation:} \\
3x-2(2x-7)=9 \\
3x-4x+14=9 \\
-x+14=9 \ \ \ |-14 \\
-x=-5 \ \ \ |\times (-1) \\
x=5 \\ \\
y=2x-7=2 \times 5-7=10-7=3 \\ \\
\boxed{(x,y)=(5,3)}$

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Ответ:

lizchavarria863

06.02.2022

Mathematics

C. ar or argon

it is the most commonly used gas between thermal window panes. argon has 34% lower thermal conductivity than air and is therefore more suitable to be used instead of air. it is also inert and does not react or causes any form of harm

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Solve the equation with substitution 3x-2y=9 y=2x-7

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