Ever seen a problem like this : 3x – yEver seen a problem like this : 3x – y Let x = 7 and y = -11Let x = 7 and y = -11 How do you figure this out??How do you figure this out?? Tip: Any number next to a letter variable you Tip: Any number next to a letter variable you

multiply them togethermultiply them together So you should input the variables.So you should input the variables. Your problem should look like this: 3(7) - (-11)Your problem should look like this: 3(7) - (-11)

4x – 3y : x = 3 & y = 4 First step! You plug in x & y to the variables. So your problem should now look like this: 4(3) – 3(4) Next you multiply both sides. Your Problem

should now look like : 12 – 12 Then solve. 12 – 12 = 0

Evaluating:

1. to determine or set the value or amount of; appraise: to evaluate property.

2. Mathematics. to ascertain the numerical value of (a function, relation, etc.).

Expressions:

1. a symbol or a combination of symbols representing a value, relation, or the like.

Evaluating Expressions is

used in many different

problems ahead that you

need to know how to do

& understand, So evaluating

expressions should help you

with many different algebra problems

( bigger more advanced problems).

Tip One: To help you in Algebra we use symbols to write out problems in words

Such as “ Seven more than a number” would be 7 + n. So you use a varible as the number because you havent figured it out yet.

Tip Two: What about writing for differences?

You can use words like Seven “ less than” a number which would look like 7 – n.

Tip Three: For multiplication you would say 7 times a number, which would look like 7n