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Big Ideas Math Integrated I, 2016 View details

1. Solving Simple Equations

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Exercise 42 Page 9

Start by defining a variable for the equation.

Equation: 20-x=-5
Temperature fall: 25 degrees

Practice makes perfect

Let x represent the change in temperature. Since the beginning temperature is 20^(∘), subtracting x from 20 gives the ending temperature of - 5^(∘). 20 - x = - 5 Solving this equation for x gives the change in temperature.

20 - x = - 5

SubEqn

LHS-20=RHS-20

- x = - 25

DivEqn

.LHS /(- 1).=.RHS /(- 1).

x = 25

The solution x=25 means that the temperature decreased by 25^(∘).