Equations

Question 1

GMAT favorite equation is:

Answer 1

Total of A = (A’s Per B) * Total of B

Question 2

Difference between an expression and an equation…

Answer 2

Equations only have an equal sign, they are equating two expressions to one another

Question 3

4 ways to simplify

Answer 3

1. Combine like terms
2. Find a common denominator
3. Pull out a common factor
4. Cancel common factors

Question 4

Solving one variable equations?

Answer 4

Isolate by using reverse PEMDAS

Question 5

Solving a system of equations?

Answer 5

1. Substitution … rearrange one to be plugged in to the other equation.

Isolate the variable you DO NOT want, as it will be removed

2. Elimination…Add or subtract the equations to remove a variable.

Typically easier to add. You can multiply or divide an equation to make it easier to eliminate

Question 6

Combo questions

What is X + y is really asking..

Answer 6

Refers to combining variables like x+y

Really asking WHAT is X = Y

Discern precise combo they want

Then you manipulate until you get a match to what is asked

Question 7

What is a potential time sink instinct when dealing with “combo Q’s”

Answer 7

Wanting to solve for a single variable first instead of isolating the combo to one side

Safer to find the “R &R” relation and ratio