Y= 2/3x-2
-3y= -2x+6
Divide by -3
I'll solve 21, and you then should be able to solve the rest on your own!
Since ADC is 135, that means that that whole angle is 135 degrees. In addition, since angles ADB and BDC add up to ADC, we get ADB+BDC=ADC=135=11x+9+7x=18x+9. Subtracting 9 from both sides, we get 126=18x. Dividing both sides by 18, we get x=7. Plugging that into 11x+9=BDC, we get 11*7+9=77+9=86
11,520 gallons of gas being used<u><em> because you need to do 240 divided by 10 which gives you 24 then you do 24 x 480 and you get 11,520.</em></u>
