Answer:
2x - y = 7
-y = -2x + 7
y = 2x - 7
A line perpendicular to this line will have a slope of -1/2. I will give you that equation in three different forms.
y + 8 = (-1/2)(x - 6) point-slope form
y + 8 = (-1/2)x + 3
y = (-1/2)x - 5 slope-intercept form
2y = -x - 10
x + 2y = -10 standard form