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Harrizon [31]
3 years ago
9

X^2+y^2=25 Y= 2x - 5What are the x coordinates

Mathematics
1 answer:
weeeeeb [17]3 years ago
6 0

Answer:

(0, -5) and (4, 3)

Step-by-step explanation:

I assume you're looking for the coordinates of the intersections, if any.

Solve by substitution:

x² + (2x − 5)² = 25

x² + 4x² − 20x + 25 = 25

5x² − 20x = 0

5x (x − 4) = 0

x = 0 or 4

So the coordinates are (0, -5) and (4, 3).

You might be interested in
X+4y=30 system by substitution <br><br> X-2y=0
Dmitry [639]

Answer:

x=10, y=5

Step-by-step explanation:

For substitution, you always want to get the variable alone. The second equation (x-2y=0) will be easier to substitute into the first equation.

x-2y=0

x=2y

You can substitute 2y as x on the first equation (x+4y=30).

2y+4y=30

6y=30

y=5

Plug y=5 into any equation.

x+4(5)=30

x+20=30

x=10

3 0
3 years ago
What is 3/10 plus 5/8
Svet_ta [14]
3/10+ 5/8 
First find a common denominator
multiply top and bottom the same
12/40 +25/40
add
37/40
3 0
4 years ago
Can someone please help me with this problem?
GenaCL600 [577]
You need to know and have memorized metric unit conversions. They are easy, you just need to know how many zeros to add.

1 cm = 10 mm
1 m = 1000 mm
1 m = 100 cm
1 km = 1000 m


 (1.) 4m + 3cm = 400cm + 3cm = 403cm
(2.) 3km + 8m = 3000m + 8m = 3008m
(3.) 7cm + 9mm = 70mm + 9mm = 79mm
(4.) 1m + 5cm = 100cm + 5cm = 105cm
(5.) 5km + 5m = 5000m + 5m = 5005m

Do you see that to switch 5km to smaller unit meters you just add the zeros on to the end. Because 1km = 1000m ; 5km = 5000m

You try the rest. let me know if you have any questions.
5 0
3 years ago
A fish swims upstream a distance of 16 miles in a river with a current of 3 miles per hour. The fish returns swimming
arlik [135]

Answer:

9 mph = the speed in still water

Step-by-step explanation:

Let r = the speed in still water

Then the speed going down stream is r + 3

and the speed going upstream is r - 3

d = rt   or t = d/r

time going downstream is 16/(r + 3) and time going upstream is 16/(r - 3)

The total time was 4 hours, so

\frac{16}{r + 3}  + \frac{16}{r - 3}  = 4   Multiply thru the equation by (r + 3)(r - 3)

Then 16(r - 3) + 16(r + 3) = 4(r + 3)(r - 3)

         16r - 48 + 16r + 48 = 4r^{2} - 36

         4r^{2} - 36 = 32r

         4r^{2} - 32r - 36 = 0

         4(r^{2}  - 8r - 9) = 0

         4(r - 9)(r + 1) = 0

             r = 9  or -1

But a rate of speed cannot be negative, so x ≠ -1

So, r = 9 mph = the speed in still water

7 0
3 years ago
Find the value of x
Leona [35]
Answer is X=-0.206
Hope this helps
Have a great night or day
6 0
3 years ago
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