D’(5,-5), E’(2,-7), F’(6,-1), G’(10,-8)
Since it’s four units right you would add 4 to the x value and 5 units down so you subtract 5 from the y value.
The answer is f(x) = 5 - 2x
Function form means just replace y with f(x).
So given 8x + 4y = 20:
Subtract 8x
4y = 20 - 8x
Divide both sides by 4
y = 5 - 2x
Centre is at the middle or the midpoint of the diameter.
And the formula of midpoint is

For the given question, x1=-4, y1=2, x2=2, y2=-8
So we will get

And that's the required centre .
Since she is doubling the box it will be 2 times bigger
1 5/8 board will be left!