A box of photographs contains 13 wedding photographs 4 vacation photographs and 8 holiday photographs one is randomly selected w
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The slope of the first line is 
.
To be perpendicular the slope of the second line must be the negative reciprocal of the first:
Use the slope-intercept formula:
Substitute known values:
Solve for
:
Complete the formula:
To be perpendicular the slope of the second line must be the negative reciprocal of the first:
Use the slope-intercept formula:
Substitute known values:
Solve for
Complete the formula: