This is a simultaneous equation. its saying there are two numbers (x and y) that satisfy both equations. Rearrange the 2nd equation to get x=30/y and substitute this into the first equation to get y=(30/y) +13. solve this for y and then you can solve for x.
2L + 2W = 28 feet
One blanket could be;
2(10) ft + 2(4) ft
The second blanket could be;
2(7) ft + 2(7) ft
Because...
2(10) + 2(4) = 20 + 8 = 28 and 2(7) + 2(7) =14 + 14 = 28
hope that helps :D
Answer:
35 one-dollar bills
18 ten dollar bills
Step-by-step explanation:
We can solve this problem by using logic. First we have to understand that if all the 53 bill were $10 bills, then the combined monetary value would be...
53 x $10 = 530$
Now we start to replace the $10 bills with 1$ and each time we replace 1 bill, the combined monetary value will decrease by...
$10 - $1 = $9
We also know that we need to decrease the combined monetary value all the way to $215, which mean there has to be...
(530 - 215) / 9 = 35 one dollar bills.
And now since we know there are 35 one-dollar bills, that means there has to be...
53 - 35 = 18 ten dollar bills
195min/1.5 miles so 130 min / 1 mile or 2h 10min (2 1/6h)
