We calculate the speed by dividing the distance over time:
s = d/t
So the distance described in the problem is always the same, A to B and B to A.
But we are told that;
7 = d/t
7 = 2d/(t + 2)
that is, the first equation say that at speed 7 km/h a distance d is walked in a time t
the second equation say that at a average speed of 7 (that is 8 on one way and 6 in the other: 8 + 6 = 14, half of it), twice the distance is walked in a time equal to the first time plus 2 minutes.
So we have a system of linear equations, 2 of them with two unknowns, we can solve that:
7 = d/t
7 = 2d/(t + 2<span>)
</span>lets simplify them:
7t = d
7(t + 2) = 2d
7t = 2d - 14
we substitute the first in the second:
<span>7t = 2d - 14
</span><span>7t = d
</span>so:
d = 2d - 14
d = 14
so the distance between A and B is 14 km
14/10 is 1.4 , 1.4/ 0.2 is 7 so 0.2 is the answer
The trick with this is take a piece of paper you can see through and draw the lines of the graph (dont write the numbers) trace the shape and then rotate it the way you need to then line it up with the rest of the graph and you have your answer
Answer: it would be 303/2500 i think
Step-by-step explanation:
Answer:
y=2/5x+4.8
Step-by-step explanation:
Proof
