Posted by **Alana** on Monday, January 23, 2012 at 8:10pm.

Lines A and B are perpendicular and have the same x-intercept. The equation of line A is x+2y-4=0. Determine the y-intercept of line B.

- Math -
**Reiny**, Monday, January 23, 2012 at 9:44pm
slope of given line = -1/2

so slope of perpendicular line = +2

x-intercept of given line, let y = 0

x-intercept is (4,0)

so new line: slope = 2, point (4,0) on it

y = 0 = 2(x-4)

y = 2x - 8

y-intercept of new line is -8 or (0, -8)

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