Answer:
B=29
Step-by-step explanation:
you have on the right hand side
which is equal to
so B=49
Step-by-step explanation:
3x + 5y = 21 * (-4) •••••• -12x -20y = -84 (a)
4x - 2y = -24 * (3) •••••• 12x -6y = -72 (b)
(a) + (b)
-26y = -156
y = 6
3x + 5 * 6 = 21
3x = 21 - 30
3x = -9
x = -3
<h2>
Answer:</h2><h2>
It takes 5.744 hours for drain B to empty the pool.</h2>
Step-by-step explanation:
Let drain A nad be are used to empty a swimming pool.
Given drain A alone can empty the pool in 4.75 hours.
When both A and B are open, it takes 2.6 hours.
The time taken by B to draint the pool = ?

2.6 (t+4.75) = 4.75t
2.6t + 12.35 = 4.75t
t = 5.744 hours
It takes 5.744 hours for drain B to empty the pool.
Answer:
6x - 5 ≤ 2x
4x ≤ 5
x ≤ 5/4
Step-by-step explanation: