Post on 04-Aug-2015
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