It can by a polynomial of degree 2 or more, eg y = ax4 + bx3 + cx2 + dx + e
Or inverse: y = a/x + b
Or power: y = a*bx
Or trigonometric: y = sin(ax + b)
etc, etc
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A linear equation IS a function. A function can look like X2+X+C, or X3+0, or X+Y+C, or many other ways. The function X+Y+C is a function in two variables, and can be a linear equation.
Well, look for a continuing pattern. Once you find one that makes sense for each value, write it into an equation....look at example below x- 2,4,6,8 y- 4,16,36,64 the rule for this function is y=x squared.
The letter of the alphabet of the absolute value function looks like a V. For this reason, it is a popular graph at Villanova University.
look it up
Assuming this is all he does to solve the equation, it would look like this: 9y = 54 He solves this by dividing 54 by 9: y = 54/9 y = 6