8-(4c-5)=11
8-4c+5=11
13-4c=11
-4c=-2
C=1/2
Answer:
- houseboat speed: 8 mph
- current speed: 2 mph
Step-by-step explanation:
The downstream speed is ...
speed = distance/time = 30 mi/(3 h) = 10 mi/h
The upstream speed is ...
distance/time = 30 mi/(5 h) = 6 mi/h
__
The downstream speed is the sum of boat speed (b) and current speed (c):
b + c = 10
The upstream speed is their difference:
b - c = 6
Adding these two equations gives ...
2b = 16
b = 8 . . . . . boat speed is 8 mph
Then the current speed is ...
c = 10 -b = 10 -8 = 2 . . . . . current speed is 2 mph
Answer:
Y = x + 10
Slope - 1/2
y-intercept - (0,10)
Y = 2x + 12
slope 2/1
y intercept (0,10)
Y = 4 x + 14
Slope 4/1
Y intercept (0,14)
Step-by-step explanation:
