Reginald F. | Tutor in Math / Physics / AstronomyTutor in Math / Physics / Astronomy

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I like the answers I saw on WyzAnt for this problem. Just one additional fine point that may be of use in other similar problems. A primary thing to note here is that there is no other variable in the equation except y ( x is unspecified and can be anything). Also observe that the value of y is specified as -2/5 + 5, which is 4.6. Therefore, the value of y is always 4.6 in this case, no matter what the value of x. So, in this two-dimensional case (plotting y versus x), the graph is a straight, horizontal line, crossing the y-axis at y = 4.6 .