Exercise 1 Page 56

In order to determine whether -9 is a solution, we will start by substituting it into the given equation. Then, we will simplify it using the Properties of Real Numbers.

y+1=8

Substitute

y= -9

-9+1? =8

CommutativePropAdd

Commutative Property of Addition

1+(-9)? =8

AddNeg

a+(- b)=a-b

1-9? =8

SubTerm

Subtract term

-8≠8 *

Since both sides are not equal, -9 is not a solution.