Number Lines Remember, the farther to the left a number is graphed on a number line, the it is. The farther to the right a number is graphed on a number line, the it is. Inequalities can be graphed on a number line. The numbers included on the graph represent values in the solution set. Reciprocals Reciprocals are multiplicative inverses in which both numbers have the same sign and can be multiplied together to equal . You can divide by a rational number or multiply by the to get the same answer. Positive and Negative Numbers When adding numbers with the same sign, add the absolute value of both numbers and the sign that is on both numbers. When adding numbers with different signs, find the difference between the absolute value of the numbers and take the sign of the number with the absolute value. When subtracting positive and negative numbers, you can add the opposite sign of the second number in the equation to the first to find the difference. When multiplying or dividing positive or negative numbers, if the signs of the numbers are the same, then the answer will be . When multiplying or dividing positive or negative numbers, if the signs of the numbers are different, then the answer will be .