Simplifying equations is often the first step to solving algebra equations. Some methods that can be used to simplify an equation are:

Combine Like Terms

Multiplication and Division of Terms

Removal of Brackets - Distributive Property

Cross Multiplication

Like terms are terms that have the same variable part i.e. they only differ in their coefficients. Combining like terms is very often required in the process of simplifying equations.

For example:

26

Like terms can be added or subtracted from one another.

For example:

2

2

4

6

8

5

6

Example 1:

Simplify: 8*xy* – 5*yx* = 1

Solution:

Step 1: 5*yx* is the same as 5*xy *using the commutative property

Step 2: Since the right side is already simple, we can work on the left side expression:

8Putting back the left side and right side of the equation:

3

Answer: 3*xy* = 1

Example 2:

Simplify: 7*a* + 5*b* – 6*b* + 8*a* + 2*b* = 0

Solution:

Step 1: Group together the like terms:

7(7

Step 2: Then simplify:

15*a* + *b* = 0

Answer: 15*a* + *b* = 0

The coefficients and variables of terms can be multiplied or divided together in the process of simplifying equations.

For example:

3 × 4*b* = 3 × 4 × *b* = 12*b*

5*a* × 3*a* = 5 × *a* × 3 × *a* = 5 × 3 × *a* × *a* = 15*a*^{2} (using exponents)

Beware! | a × a = a^{2} |

a + a = 2a |

Example 1:

Simplify: 4*a* × 5*a* ÷ 2*a* = 60

Solution:

Step 1: Perform the multiplication and division

Step 2: Isolate variable *a *

Answer: *a* = 6

Sometimes removing brackets (parenthesis) allows us to simplify the expression. Brackets can be removed by using the distributive property. This is often useful in simplifying equations.

For example:

3(*a* – 3) + 4 = 3 × *a* + 3 × (-3) + 4 = 3*a* – 9 + 4 = 3*a* – 5

5 – 6 (*b* + 1) = 5 + ( – 6 ) × *b* + (– 6) × 1 = 5 – 6*b* – 6 = – 6*b* – 1

Example 1:

Simplify: 5(*a* – 4) + 3 = 8

Solution:

Step 1: Remove the brackets

5*a* – 20 + 3 = 8

Step 2: Isolate variable *a *

5*a* = 8 – 3 + 20

5*a* = 25

Answer: *a* = 5

Cross multiplication allows you to remove denominators from fractions in an equation. Note that this technique applies only towards simplifying equations, not to simplifying expressions.

For example, if you have the equation:

then you can multiply the numerator of one fraction with the denominator of the other fraction (across the = sign) as shown:

to obtain the equation

(2 × 6) = *a* × 3

Example 1:

Simplify:

Solution:

Step 1: Cross Multiply

4 × *a* = 8 × 5

4*a* = 40

Step 2: Isolate variable *a *

Answer:* a* = 10

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