Are the graphs of each euation perpendicular? 2x-5y= -3 and 2x+5y= 4

First, change these equations into y-intercept form.

2x - 5y = -3                                    2x + 5y = 4
-5y = -3 - 2x                                   5y = 4 - 2x
y = 3/5 + 2x/5                                 y = 4/5 - 2x/5

The equations are not perpendicular to each other because the slopes are not negative reciprocal.

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