In inverese, when x increases, y deceases, when x decreases, y increses
we see that x increases for all choices
therefor the y values of the answer should be decreasing
first one is increasing, wrong
second is decreasing
third is also decreasing
fourth is increasing
look at second and third
remember
xy=k for inverse
so just solve for k for each and see if it is valid
second
1,60
(1)(60)=k
60=k
2,30
(2)(30)=60
60=60
true
therefor this is nswer
2nd option is answer
Answer: 3/7
Step-by-step explanation:
In mathematics, a triangle group is a group that can be realized geometrically by sequences of reflections across the sides of a triangle. The triangle can be an ordinary Euclidean triangle, a triangle on the sphere, or a hyperbolic triangle. Each triangle group is the symmetry group of a tiling of the Euclidean plane, the sphere, or the hyperbolic plane by congruent triangles, a fundamental domain for the action, called a Möbius triangle.
The correct answer to the first task, is:
7(x-3) = 4(x + 5) ( im assuming x + 5 by the ordering of the numbers, and ive seen many people doing the same mistake.)
7x-21 = 4x + 20
7x-4x = 21+20
3x = 41
The answer is 41/3.
I found this quite ugly, so i will do it by multiplication as it is acctualy written, also.
7x - 21 = 20x
7x-20x = 21
-13x = 21
x = -21/13 which is just as ugly.
If i input a - however:
7x-21 = 4x-20
3x = 1
x = 1/3
Thats all the possible answers, (except by division).
The correct answer to the second task, is 14 - x. Because she was x years younger than 14.
This is the answer with standard procedure