Question about Texas Instruments TI-89 Calculator

# Inequality My TI89 does not solve the inequality (3x + 1)/x < 0. However several students of mine can. How is this possible?

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Posted on Sep 18, 2016

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You need to input the equation, (3x+1)/x<0, then you need to indicate that you are solving for x by putting comma then x. The equation you are inputting should look like this: solve((3x+1)/x<0,x) and the answer will be -1/3<x<0. That ",x" is telling the calculator to solve for x.

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And your question is? If you just want to know how to solve this system, you only need to substitute one equation into the other and solve for the remaining unknown.

y=3x (equation 2), so plug it into equation 1

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from equation 2 then, you know y=3x=3

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