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Pearson Algebra 1 Common Core, 2011 View details

2. Solving Two-Step Equations

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Exercise 69 Page 93

How can we isolate x on the left-hand side?

x=5

Practice makes perfect

To solve the equation, we have to isolate x on one side of the equation. By dividing both sides of the equation by -5, we can remove the coefficient from x.

-5x=-25

DivEqn

.LHS /(-5).=.RHS /(-5).

-5x/-5=-25/-5

DivNegNeg

- a/- b=a/b

x=25/5

CalcQuot

Calculate quotient

x=5

To check that we have the correct solution, we can substitute x=5 into the original equation.

-5x=-25