Can someone help me with this? pls

Mathematics

1 answer:

LenaWriter [7]3 years ago

3 0

I can't see the whole question and which one do you need?

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21/7=3mins per wall with 5 people.
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Hello,

$\left \{ {{3x+2y=-21} \atop {x-3y=4}} \right. \\\\
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 \left \{ {{3(4+3y)+2y=-21} \atop {x=4+3y}} \right. \\\\

 \left \{ {{12+9y+2y=-21} \atop {x=4+3y}} \right. \\\\
 \left \{ {{12+11y=-21} \atop {x=4+3y}} \right. \\\\
 \left \{ {{11y=-21-12} \atop {x=4+3y}} \right. \\\\
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