Answer:
see below
Step-by-step explanation:
butterfly = x minutes
breast = y minutes
total is 50 minutes
breast stroke = butterfly +20
Part A
x+y = 50
y = x+20
Part B
Substitute the second equation into the first
x+ (x+20) = 50
2x+20 = 50
2x+20-20 = 50-20
2x = 30
2x/2 = 30/2
x = 15
y = x+20
y = 20+15
y = 35 minutes
35 minutes on the breast stroke
Part C
45 minutes on the butterfly is not reasonable
We only have a total of 50 minutes
50-45 = 5
But he spend more time on the breast stroke ( 20 minutes more), but if he spend 45 minutes on the butterfly, he would have to spend less on the breast stroke.
Answer:
x=-3, y=5
Step-by-step explanation:
6x + 2y = -8 3x - 2y = -19
Add the two equations together to eliminate y
6x + 2y = -8
3x - 2y = -19
------------------------
9x = -27
Divide each side by 9
9x/9 = -27/9
x = -3
Now we find y
6x + 2y = -8
6(-3) +2y = -8
-18+2y = -8
Add 18 to each side
-18+18 +2y = -8+18
2y = 10
Divide by 2
2y/2 = 10/2
y =5
Answer:4.992
Step-by-step explanation: 2.4 • 2.08
1/2 times 2+3
1/2 times 2
equal 1
1 plus 3
equal 4
