Tuesday, January 14, 2014

Solve the inequality step by step. Explain, please, each step! -7-3x

First, we have to subtract 5x, both sides of the inequality:


-7-3x-5x<5x-5x+29


-7-8x<29


Now, we'll keep the unknown to the left side of the inequality and we'll multiply the inequality, both sides, by -1. Because of the negative value, the sign of the inequality will be changed, after multiplying.


7+8x>-29


Now, we'll subtract 7, both sides of the inequality, and we'll get:


7-7+8x>-29-7


8x>-36


Now, we'll divide the inequality by 8:


x>-36/8


x>-9/2


The solution of the inequality consists in all x values from the interval (-9/2, inf).

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