B. -2.5
Step-by-step explanation:
This is asking for gradient. Pick any two points (x, y) then calculate the y change ÷ x change. example, (0, -5) and (-2, 0). with [0-(-5) ÷ -2-0] you get -2.5
Answer:
17
Step-by-step explanation:
We can use this formula:
where x and y indicate the coordinates of the two points
![\sqrt{4-(-4)^2 + (8-(-7)^2} = \sqrt{64 + 225} = \sqrt{289} = 17](https://tex.z-dn.net/?f=%5Csqrt%7B4-%28-4%29%5E2%20%2B%20%288-%28-7%29%5E2%7D%20%3D%20%5Csqrt%7B64%20%2B%20225%7D%20%3D%20%5Csqrt%7B289%7D%20%3D%2017)
4x + 5y = -13
2(4x + 5y) = 2(-13)
8x + 10y = -26 (equation 1)
5x - 2y = -8
5(5x - 2y) = 5(-8)
25x - 10y = -40 (equation 2)
equation 1 + equation 2,
(8x + 10y) + (25x - 10y) = (-26) + (-40)
8x + 10y + 25x - 10y = -26 + -40
33x = -66
x = -2
substitute x = -2 into equation 1,
8x + 10y = -26
8(-2) + 10y = -26
-16 + 10y = -26
10y = -10
y = -1
The values of x and y are -2 and -1 respectively.
(original - new)/original * 100%
(48-15)/48 * 100%
33/48 *100%
68.75 % decrease