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Expert: - 9/2/2010


Question
I have a straight line linear equation, I think it's a bit crazy, but here it is:
 -0.004 = 0.001x - 0.02

I need to know the value of the x-intercept. Can't figure it out...

Thanks!!

Answer
Hello Nick,

The x-intercept corresponds to y=0.
So, just let y=0 then solve for x.

The problem here is that your equation is free of y!
If the equation is correct, then just solve for x anyhow.
-0.004 = 0.001x - 0.02, add 0.02 to both sides
0.016 = 0.001x, now divide both sides by 0.001 to get
x=16

Abe

Algebra

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Volunteer

Abe Mantell

Expertise

Hello, I am a college professor of mathematics and regularly teach all levels from elementary mathematics through differential equations, and would be happy to assist anyone with such questions!

Experience

Over 15 years teaching at the college level.

Organizations
NCTM, NYSMATYC, AMATYC, MAA, NYSUT, AFT.

Education/Credentials
B.S. in Mathematics from Rensselaer Polytechnic Institute
M.S. (and A.B.D.) in Applied Mathematics from SUNY @ Stony Brook

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