Any F(x) = P(x) + b, where b = 0 and P(x) can be factored by x.
Ex) y = 843x
y = x^32 + x^23 + 4x
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Set 'x' equal to zero, and solve the remaining equation for 'y'.
On the standard Cartesian graph, horizontal lines have zero slope. They all have the equation Y = a number
Not all equations are equated to zero, but usually we set a function equal to zero if we want to find its x intercepts, or where the graph of the function crosses the x axis.
No; if the slope is zero and it is above or below y=0 it will not have an x intercept.
I would set up a table of values and calculate several of the values of the variables (I would try to calculate the "interesting" values setting one to zero and calculating the other(s), guessing at a maximum or minimum value etc. Then I would plot the values on graph paper.