Pearson Algebra 1 Common Core, 2011
PA
Pearson Algebra 1 Common Core, 2011 View details
1. Solving One-Step Equations
Continue to next subchapter

Exercise 17 Page 85

How can you isolate d on one side?

d=7.5

Practice makes perfect
To solve the equation we have to isolate d on one side. By adding 2 to both sides, we can cancel out the - 2 and isolate d.
5.5=-2+d
5.5+2=-2+d+2
5.5+2=-2+2+d
7.5=d
d=7.5
Therefore, d=7.5 is the solution to the equation. To check that we have the correct solution, we can substitute d=7.5 into the original equation and simplify.
5.5=-2+d
5.5? =-2+ 7.5
5.5? =7.5+(-2)
5.5? =7.5-2
5.5=5.5
Since the left-hand side and right-hand side are equal, d=7.5 is the correct solution.