A function associates a value from a set (domain) one and only one value from another set. IE, from the same x value you can have only one y. So pick a ruler and scan each graph parallel to the Y axis. If you touch the blue line in two points, that's not a function.
The easiest ways is to use the quadratic formula that is:
x' = [-b+√(b² - 4ac)]/2a and x" = [-b -√(b² - 4ac)]/2a
Solving : 2x² + 5x - 11 = 0, gives:
x' = [-5+√(25 - 4(2)(-11)]/4 and x" = [-5-√(25 - 4(2)(-11)]/4
x' = (-5+√113)/4 & x" = (-5-√113)/4
Answer:
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First, let us find the slope of 4x- y = -8.
-y=-4x-8
y=4x+8
It can be any equation with a slope that is the opposite reciprocal of 4 which is -1/4.
answer: y=-1/4x is a possible equation