Homework Help: math

Posted by Megan on Wednesday, August 23, 2006 at 8:35pm.

(4,-2) and (2,-8) lie on the line Ax-2By = 28. What is the value of A?

SOMEONE PLEASE HELP ME!!
THANK YOU SOOOO MUCH!

4,-2) and (2,-8) lie on the line Ax-2By = 28. What is the value of A?
Put the points in. First one.
A4-2B(-2)=28
4A+4B=28
A+B=7 call this equation 1)
second point:
A2-2B(-8)=28
2A+16B=28
A+8B=14 call this equation 2)

Now you have two equations...
A+B=7
A+8B=14
Now solve for A and B by any number of methods.

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