It is known that the image of positive ratio function passes (- 4,8) 1) if the points (a, - 1) and (2, - b) are on the image, the values of a and B are obtained

It is known that the image of positive ratio function passes (- 4,8) 1) if the points (a, - 1) and (2, - b) are on the image, the values of a and B are obtained

Let positive proportion function
y=kx
(- 4,8) is substituted into the above formula to obtain k = - 2
y=-2x
Substitute (a, - 1) (2, - b) into the above formula respectively
A = 1 / 2, B = 4

If y + 3 is known to be in direct proportion to x, and x = 2, y = 7. Translate the image of the function so that it passes through the point (4. - 3), and find the analytic expression of the line after translation

That is y + 3 = KX
y=kx-3
x=2
y=2k-3=7
k=5
So y = 5x-3
In translation, K is equal
So it's y = 5x + B
So - 3 = 20 + B
b=-17
y=5x-17

The analytic expression of the function image is ()
A. y=-2x+7B. y=-6x+3C. y=-2x-1D. y=-2x-5

The analytic expression of the function image is y + 4 = - 2x + 3, that is y = - 2x-1, after the image of the function y = - 2x + 3 is translated down four units