12(x + y) = 33614(x - y) = 336x + y = 28x - y = 24----------------2x = 52 x = 26 y = 2The boat went 26 mph and the current was 2 mph.12)10W + 12D = 380 6W + 8D = 2442(10W + 12D = 380)-3( 6W + 8D = 244) 20W + 24D = 760-18W - 24D = -732------------------------------ 2W = 28 W = 14 D = 20Windflower bulbs are $14 and daffodil bulbs are $20 I hope that helps!! :-)-Ill do the first one.1) the sum of the digits of a certain two-digit number is 7. Reversing its digits increase the number by 9.......
33S + 154L = 2233
-33S - 33L = -660
--------------------------------
121L = 1573
L = 13
S = 7
Large boxes cost $13 and small boxes cost $7. <==ANSWER
11) A boat traveled 336 miles downstream and back. The trip downstream took 12 hours. The trip back took 14 hours. What is the speed of the boat in still water? what is the speed of the current?
12(x + y) = 336
14(x - y) = 336
x + y = 28
x - y = 24
----------------
2x = 52
x = 26
y = 2
The boat went 26 mph and the current was 2 mph.<==ANSWER
12)
10W + 12D = 380
6W + 8D = 244
2(10W + 12D = 380)
-3( 6W + 8D = 244)
20W + 24D = 760
-18W - 24D = -732
------------------------------
2W = 28
W = 14
D = 20
Windflower bulbs are $14 and daffodil bulbs are $20 <==ANSWER
I hope that helps!! :-)
I'll do the first one.
1) the sum of the digits of a certain two-digit number is 7. Reversing its digits increase the number by 9.
What is the number?
Let the two digits be x and y, so that the number is 10x + y. Its reverse would then be10y + x.
So, we know that
x+y = 7
10y+x = 10x+y + 9
Then solve these two equations in two unknowns.
