When y=4, x=8/5
9
5x=11y
No translation will invert a quadratic graph.
17
12
-9
y = 5x + 2
y=-5x+8 the slope is -5.
To work out y=-5x-10 you can plot a graph.
17
-5
The graphs of y = 5x - 2 and y = x - 2 will have different slopes but with the same y intercepts.
When y=4, x=8/5
5x-y equals 18 = -13
8
23