Karen M.

asked • 06/23/18# When two straight lines 3x-(a-3) y-6=0 and (a+1) x+y-1=0 are vertical to each other, then the fixed number a is equal to…?

I am studying for a test with asian mathematics, and I can't solve or think about this anymore. I tried everything I know.

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## 1 Expert Answer

Arturo O. answered • 06/23/18

Experienced Physics Teacher for Physics Tutoring

Student,

Perhaps you meant to say the 2 lines are PERPENDICULAR to each other? If so, find the slope of both lines in terms of a, set the product of the slopes equal to -1, and solve for a.

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Mark M.

06/23/18