Exercise 58 Page 250

We are told that Jerry's electric bill is $ 23 less than his natural gas bill. We want to determine the equation that can be used to find the amount of his natural gas bill. Let g be the amount of his natural gas bill. From here, we can write an algebraic expression for each bill. Natural Gas Bill:& g Electric Bill:& g- 23 We also know that the sum of the two bills is $109. With this information, we can write an equation by setting the sum of expressions equal to 109. g+( g -23)= 109 ⇔ 2g-23=109 Therefore, the equation that we are looking for is given by option D.