Answer:
As x increases, y decreases and then increases.
Step-by-step explanation:
You can see in the graph as the x values are moving to the right (increasing), the y values go down first (decreasing), then go up (increasing). So basically you can see that as x increases, y decreases first, then starts to increase.
Answer:
20km
Step-by-step explanation:
we need to find c, which is the hypotenuse of the right triangle.
we know the lengths of the legs, which are given as 16km and 12km
you might notice that 16km and 12km can both be divided by 4, which will then give is 4 and 3.
3,4,5 is a pythagorean triple-(the sums of the squares of 3 and 4 is equal to the square of 5).
The triple can be proved:
3²+4²=5²
9+16=25
25=25
that means the lengths of the triangle is a multiple of the triple 3, 4, and 5
so that means that c is 5*something
since 12 and 16 are 3*4 and 4*4 respectively, that means that c must be 5*4=20km
Hope this helps!
Answer:
you just multiply it
Step-by-step explanation:
x=36
Answer:
y = 2x - 25
Step-by-step explanation:
First find the gradient, we can see it goes through (30,35) and 35,45), and since gradient is found by 'change in y / change in x' we can do: (45-35) / (35-30) = 10/5 = 2
So we know we are looking for an equation with 2x in it.
We have two options: y = 2x - 25 and y = 2x - 75.
Plug in one of the points and see which of the equations works.
Replacing y with 35 and x with 30 in the first equation we have: 35 = 2(30) - 25 = 60 - 25 = 35, this is indeed true.
However if we did the same with the second equation: 35 = 2(30)-75 = 60 - 75 = -15, this is false since 35 does not equal -15, so it can't be the second equation.
In conclusion it must be y = 2x - 25
The second 4 is greater than the first one