Inequalities can be solved in the same way as equations, by performing inverse operations on both sides until the variable is isolated. The only difference is that when you divide or multiply by a negative number, you must reverse the inequality sign. Notice that dividing by - 0.4 is the same as multiplying by 10 and then dividing by -4.
The above tells us that all values less than or equal to 30 will satisfy the inequality. Below we demonstrate the inequality by graphing the solution set on a number line. Notice that y can equal 30, which we show with a closed circle on the number line.
