Multiply the first equation by 3 and tge second by 4:
12x+15y=-45
-12x-8y=52
then add the equations:
0x+7y=7
7y=7
y=1
so 4x+5(1)=-15
4x+5=-15
4x=-20
x=-5
Answer:
Width: 4
Length: 9
Step-by-step explanation:
P = 2( l + w)
26 = 2(2x + 1 + x)
26 = 2(3x + 1)
26 = 6x + 2
6x = 24
x = 4
l = 2x + 1
2(4) + 1 = 9
Answer:

Step-by-step explanation:
4 people use all three facilities, then
- 16 - 4 = 12 people use the gym and the track and do not use the pool;
- 9 - 4 = 5 people use the pool and the track and do not use the gym;
- 19 - 4 = 15 people use the gym and the pool and do not use the track.
At least two facilities use 4 + 12 + 5 + 15 = 36 people, 4 of them use all three facilities. Thus, the probability that a randomly selected person which uses at least two facilities, uses all the facilities is

Answer: -16n-41
Step-by-step explanation:
first, distribute 2 through the parentheses:
<u>2(-n-3)</u>-7(5+2n) = <u>-2n-6</u>-7(5+2n)
second, distribute 7 through the parenthesis:
-2n-6<u>-7(5+2n) </u>= -2n-6<u>-35-14n</u>
Collect like terms:
<u>-2n</u>-6-35 and <u>-16n</u>-6-35
Calculate the difference:
-2n<u>-6-35</u>-14n = -16n-<u>41</u>
SOLUTION:
<u>-16n-41</u>