cant figure this out

Slopes of two perpendicular lines are opposite reciprocals.

Slope of the given line is " - 1/5 " ---> slope of the perpendicular line will be "5".

Let's use point-slope form of linear equation

y - y_{1} = m (x - x_{1})

*I assume, that given coordinates are (3, - 4), because you wrote (3-4)!!!
*

y - (-4) = 5(x - 3)

y + 4 = 5x - 15

y = 5x - 15 - 4

**y = 5x - 19**

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