Answer:
(- 5, 1 )
Step-by-step explanation:
- 6x - 14y = 16 → (1)
- 2x + 7y = 17 → (2)
Multiplying (2) by - 3 and adding to (1) will eliminate the x- term
6x - 21y = - 51 → (3)
Add (1) and (3) term by term to eliminate x
0 - 35y = - 35
- 35y = - 35 ( divide both sides by - 35 )
y = 1
Substitute y = 1 into either of the 2 equations and solve for x
Substituting into (1)
- 6x - 14(1) = 16
- 6x - 14 = 16 ( add 14 to both sides )
- 6x = 30 ( divide both sides by - 6 )
x = - 5
solution is (- 5, 1 )
Answer:
A
Step-by-step explanation:
Answer:
v = 15 miles / hour
Step-by-step explanation:
Given:
Distance covered by biker = s=45 miles
time taken by him = t=180 minutes
TO Find:
speed in miles per hour = v = ?
Solution:
As it is given that the distance covered is 45 miles
and time taken by him is 180 minutes
as one hour have 60 minutes
so time taken by rider = t = 180 /60
= 3 hours
this step is done because we have to find speed in miles per hour
Now
The formula for finding the distance is
distance = speed * time
or
s = v * t
we have to find v
so dividing both sides by t
![\frac{s}{t} = \frac{v*t}{t}](https://tex.z-dn.net/?f=%5Cfrac%7Bs%7D%7Bt%7D%20%3D%20%5Cfrac%7Bv%2At%7D%7Bt%7D)
it becomes
![v = \frac{s}{t}](https://tex.z-dn.net/?f=v%20%3D%20%5Cfrac%7Bs%7D%7Bt%7D)
Putting the values
![v = \frac{45}{3}](https://tex.z-dn.net/?f=v%20%3D%20%5Cfrac%7B45%7D%7B3%7D)
solving it gives
v = 15 miles / hour
which is the required speed
in the given options it is not available
Answer:
y = 12-(61) is the answer !!