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Slope intercept form:
y= mx+ b
Where:
m= slope
b= y-intercept
For: y=-7x+5
m= -7
Perpendicular lines have negative inverse slopes.
Negative inverse of -7 = 1/7
So far we have
y= 1/7x + b
Replace (x,y) fo the given point (0,0) and solve for b:
0= 1/7(0) + b
b= 0
Final equation:
y= 1/7x