A boat travels 105 km downstream in 5 hours. The return trip upstream takes 7 hours. Find the speed of the boat in still water a
1 answer:
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Answer:
5 (for c only)
Step-by-step explanation:
for c:
1st cleaning company:
2nd cleaning company:
set up as a system of equations. for them to cancle out make the y of one equation negative. I'll be making the second one negative ( it doesn't matter though)
it will look like:
make the two equations on top of eachother and line the terms up. Then combine them. The variable "y" will cancle out and you'll be left with
then you will add 3x to both sides to get then divide both sides by 3 to get
if you plug in 5 for x into both of the original equations you will see that they will both make $100 in five hours. So you answer is 5