Exercise 86 Page 337

a Every equation has an equals sign and values or expressions on either side of the

equals

sign .

Key phrases such as

is,

is equal to,

equals,

or in this case,

was,

tell us about the placement of the equals sign.

The number of pizza slices sold = 20 less than twice the number of burritos

On the left-hand side we have the number of pizza slices sold, which we can assign an arbitrary variable to. We will choose

p

as our variable.

b To solve the system of equations from Part A we can use the Substitution Method, as the first equation is already solved for

p .

6.3.1 Solving Systems Using Elimination p.337-338

6.3.2 More Elimination p.341

6.3.3 Making Connections: Systems, Solutions, and Graphs p.344-346