Exercise 3 Page 247

To solve an equation, we isolate x on one side. Using the Multiplication Property of Equality, we will multiply both sides of the equation by 20. This will get rid of the denominator of the fraction.

x÷20=120

DivToFrac

a÷ b=a/b

x/20=120

MultEqn

LHS * 20=RHS* 20

x/20*20=120*20

FracMultDenomToNumber

a/20* 20 = a

x=120*20

Multiply

Multiply

x=2400

To check that this solution is correct, let's substitute x=2400 into the original equation and simplify.

x÷20=120

Substitute

x= 2400

2400÷20? =120

CalcQuot

Calculate quotient

120=120 ✓

Since the left-hand side and the right-hand side are equal, x=2400 is the correct solution.