The speed of boat is 11 km/h in still water and speed of current is 7 km/h.
Step-by-step explanation:
Combined speed of boat and current while going down = 18 km/h
Combined speed while coming up = 4 km/h
Let,
Speed of boat = x
Speed of current = y
As boat and current were in same direction while going down,
x+y = 18 Eqn 1
We will subtract the speed of current while coming up because both the boat and current will be in opposite directions.
x-y = 4 Eqn 2
Adding Eqn 1 and Eqn 2
Dividing both sides by 2
Putting x=11 in Eqn 1
The speed of boat is 11 km/h in still water and speed of current is 7 km/h.
Keywords: linear equation, speed
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The problem is 3+6x = 15 with x being the number of white numbers.
Isolate variable by subtracting 3 on both sides: 6x = 12.
Isolate variable by dividing 6 on both sides: x = 2
The number of white marbles is 2.
answer:
-1
work:
y = mx+ b
so we can tell that the Y intercept is 1, so we can plug that in. ( + b is the y-intercept)
y = mx + 1
plug in some values to find the slope.
(-1, 2)
2 = -m + 1
- 1 - 1
1 = -1m
/-1 /-1
-1 = m
the slope is -1.
i hope this helps! :D
Answer:
-1
Step-by-step explanation:
We can use the slope formula
m = (y2-y1)/(x2-x1)
m= (5-7)/(3-1)
= -2 /2
= -1