Answer:
A = 1
B = 2
C = 10
Step-by-step explanation:
slope intercept form is
y = mx + b
m is the slope
b is the y-intercept
The slopes of parallel lines are negative reciprocals
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y = 2x + 7
slope = 2
slope of perpendicular line is the negative reciprocal of 2
slope = -1/2
y = 5x - 5
y-intercept is -5
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slope intercept form of perpendicular line
using slope = -1/2 and y-intercept = -5
y = -(1/2)x - 5
Change to standard form:
multiply both sides by 2
2y = -x - 10
Add x + 10 to both sides
x + 2y + 10 = 0
Therefor
A = 1
B = 2
C = 10
