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Firlakuza [10]
3 years ago
13

I need help with #3 plz

Mathematics
1 answer:
SVEN [57.7K]3 years ago
3 0
I think it's to late, but...

Just turn the second equation into y equals mx plus b form

Then graph both equations

Pretty easy so far

After graphing them, you just have to find where they intersect, and that is your answer. 

If they're parrallel, then there is no solution.

If it's the same line, then it's many solutions.

HOPE THIS HELPED

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A boat travels 12 km upstream and back in 1 hour 45 minutes. If the speed of the current is 3 km/h throughout, find the speed of
Elza [17]

Answer:

14.3 km/h   to 3 significant figures

Step-by-step explanation:

Let time travelling upstream be t1 hours and downstream = t2 hours.

t1 + t2 = 1.75..........................(1)

Let v  be the speed of the boat in still water.

12 / t1 = v - 3.........................(2)

12 /  t2 = v + 3........................(3)

From (1) and (3) , substituting for t2:-

12 / (1.75 - t1) = v + 3 ..................(4)

Subtract:-   (2) - (4):-

12 / t1 - 12 / (1.75 - t1) = -6

12(1 .75 - t1) - 12t1 = -6t1(1.75 -  t1)

21 - 12t1 - 12t1 = -10.5t1 + 6t^2

6t1^2 + 13.5t1 - 21 = 0

Solving this gives t1 = 1.058 hours

Therefore the speed in still water (v)  = 12/1.058 + 3 = 14.3 to 3 sig figs

3 0
3 years ago
Myra takes 2hours to plant 50 flower bulbs. Francis takes 3 hours to plant 45 flower bulbs. Working together, how long should it
crimeas [40]

Answer:37 and half hrs


Step-by-step explanation:


This is what I get


Myra: 50/2= 25 bulbs/hr.

Francis: 45/3= 15 bulbs/ hr


25+15= 40/hr. Together per hr

Need to find 150 bulbs how many hrs


40/1=150/t

40t=150

T= 150/4

T= 37.5


37hrs and 1/2


4 0
3 years ago
Please help I literally don't understand-
Ivenika [448]
Well, QR is the hypotenuse of the triangle and PT is another side of the triangle. You can use phythagoras theorem to work this out. So squareroot 13-8. That should give your your answer
4 0
3 years ago
Read 2 more answers
If I subtract the square root of 10 and -4, my answer will be
masha68 [24]

root(10)+4

......

you cant simplify it

5 0
3 years ago
Find variable values for two variables in an equation
never [62]

Simplifying

2x + 3y = 12

Solving

2x + 3y = 12

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-3y' to each side of the equation.

2x + 3y + -3y = 12 + -3y

Combine like terms: 3y + -3y = 0

2x + 0 = 12 + -3y

2x = 12 + -3y

Divide each side by '2'.

x = 6 + -1.5y

Simplifying

x = 6 + -1.5y

5 0
3 years ago
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