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Solve the following system:
{4 x + 9 y = 5 | (equation 1)
7 y - 4 x = 11 | (equation 2)
Add equation 1 to equation 2:
{4 x + 9 y = 5 | (equation 1)
0 x+16 y = 16 | (equation 2)
Divide equation 2 by 16:
{4 x + 9 y = 5 | (equation 1)
0 x+y = 1 | (equation 2)
Subtract 9 × (equation 2) from equation 1:
{4 x+0 y = -4 | (equation 1)
0 x+y = 1 | (equation 2)
Divide equation 1 by 4:
{x+0 y = -1 | (equation 1)
0 x+y = 1 | (equation 2)
Collect results:
Answer: |x = -1 and y = 1

GuestFeb 8, 2017

#3

0

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GuestFeb 8, 2017

#4

+61

+25

I meant year

oh yeah,

BTW

CASH YOU OUSSIDE HOWBOW DAH

CASH ME OUTSIDE HOW 'BOUT DAT

martindFeb 8, 2017

#1

0

Distance = Rate x time

Going upriver D = (x-c) * 1/2 hr where x= boat speed c = current speed

Going DOWNriver D = (x+c) * 1/4 hr

The D's are the same distance...

(x-c)* 1/2 = (x+c) * 1/4

1/2 x - 1/2 c = 1/4 x +1/4c

1/4x = 3/4c

x = 3 c c= 3 km/hr) x = boat speed = 3 * 3km/hr = 9 km/hr in still water

(Does she TRY to ski behind THIS slow boat??)

GuestFeb 8, 2017

#2

0

You can't solve for n without more information!!. If you know the answer to the combination, then maybe you can get somewhere. Even so, it would very difficult to solve for n, especially if n is large. Example: nC5 =591,600,030=n! / {[n - 5]! * 5!} =591,600,030.

You can try to solve for n, but it is very difficult because iteration and interpolation will have to be used to find n. In this example n=150.

GuestFeb 8, 2017

#3