12x-2by=12 3ax-by=6 please help asnwrr id really appreciate it

The system of equations mentioned in the problem are \begin{align*}12x-2by=&\;12\ 3ax-by=&\;6 &\;\intertext{The value of $a$ and $b$ if $(x,y)=(2,3)$} 12(2)-2b( ...

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i leave the calculator work to you.

7. diameter 4 miles, circumference 4π miles

8. radius 0.2 miles, circumference 0.4π miles

[this is a bad problem because the actual radius of a car on the track is less than 0.2 miles so the answer is less than 0.4π miles]

9. radius 6 feet, circumference 12π feet

10. diameter 14 cm, circumference 14π cm

11. diameter 4.8 feet, circumference 4.8π feet

how long did the flood last

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then i will answer