The sum of a number and 19 is at least 8.2. What is the number?

2 Answers
Jan 24, 2016

-10.810.8

Explanation:

Let the number be x

Then x+19=8.2x+19=8.2

rarrx=8.2-19x=8.219

x=-10.8x=10.8

Feb 2, 2017

The term "at least" means that the number can be a range of values.

Explanation:

Define

Let xx be the number.

Write the equation

x+19 >= 8.2x+198.2

Subtract 19 from both sides of the inequality

x >= 8.2-19x8.219

Simplify

x >= -10.8x10.8

So xx can be any number greater or equal to -10.810.8