Exercise 69 Page 100

The last part of the sentence, ...the result is -8, tells us that something should be equal to -8. So far we have the following equation. ...=-8The phrase that comes before ...the result is -8 tells us what should be on the left-hand side of the equation. When a number is increased by 3 and that number is doubled means that we should add 3 to some number, which we can call x, and then multiply this sum by 2. Now we can finish the equation. When a number is increased by 3 and that number is doubled, the result is - 8 2( x + 3) = - 8 We can solve the equation by isolating x on the left-hand side.

Therefore, the solution to the equation is x=-7, which corresponds to the option B.