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.

Mark M.

Do you mean that both lines are vertical?


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