ISEE Lower Level Math : How to find the solution to an equation
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Example Questions
Example Question #91 : Equations
If 
Sometimes we use letters instead of numbers if we don't know what number ought to go in a certain place. Saying "
We're looking for 
Example Question #91 : Equations
Solve the following equations:
To solve the equation you must get 
Example Question #91 : Equations
Solve the following equation for c when 
Solve the following equation for c when 
We can begin by plugging in 6 for b:
Simplify
Next, take the square root of both sides to get:
Note that our answer is plus or minus five, because squaring positive or negative five will yield 25.
Example Question #94 : Equations
Solve the following equation for z when x=5, and y=2.
Solve the following equation for z when x=5, and y=2.
Let's begin by dividing the whole equation by 3. This will get "z" by itself and make our equaiton easier to work with.
Next, plug our given values in and simplify
So, we get:
Example Question #95 : Equations
If Timmy had 
To solve a word problem with an unknown quantity, treat the unknown quantity as a variable. The best equation for the problem above is:
Use algebra to solve.
Example Question #96 : Equations
An unknown number of children are on the bus on their way home from school. At the first stop, eight children get off the bus, at the second, fifteen get off, and at the third and final stop four children get off. There are no children left on the bus. How many were on the bus at the start of its route?
To solve a word problem with an unknown quantity, treat the unknown quantity as a variable. The best equation for the problem above is:
Example Question #91 : How To Find The Solution To An Equation
Mrs. Franklin has twenty stickers, and she wants to distribute them evenly among four students. How many stickers will each student receive?
To solve a word problem with an unknown quantity, treat the unknown quantity as a variable. The best equation for the problem above is:
Example Question #92 : How To Find The Solution To An Equation
If it costs twelve dollars to buy an action figure, and Joanna bought eight action figures, how much money did she pay for them?
To solve a word problem with an unknown quantity, treat the unknown quantity as a variable. The best equation for the problem above is:
Example Question #99 : Equations
Solve the following equation if 
Since you already know that 
This gives you,
Performing algebraic operations to simplify results in the following.
and
Therefore,
Example Question #94 : Equations
If the side of a square is 
The formula for the area of a square is length times width.
The question gives,
In order to solve this, substitute in the given information into the area formula.
From here find the square root of both sides.
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