Top Answer

If you have:x-2And you know that x=6...... then you can "substitute" 6 for x:6-2=4

Example 1: If x=5 then what is 10/x + 4 ?

Put "5" where "x" is:

10/5 + 4 = 2 + 4 = 6

Example 2: If x=3 and y=4, then what is x2 + xy?

Put "3" where "x" is, and "4" where "y" is:

32 + 3×4 = 3×3 + 12 = 21

Example 3: If x=3 (but you don't know "y"), then what is x2 + xy ?

Put "3" where "x" is:

32 + 3y = 9 + 3y

(that is as far as you can get)

As that last example showed, you may not always get a number for an answer, sometimes just a simpler formula.

Negative NumbersWhen substituting negative numbers, put () around them so you get the calculations right.Example 4: If x = -2, then what is 1-x+x2?

Put "(-2)" where "x" is:

1 - (-2) + (-2)2 = 1 + 2 + 4 = 7

Note: if you don't know why

- the - (-2) became +2 or
- the (-2)2 became +4

then here is a quick summary: RuleAdding or SubtractingMultiplying or DividingTwo like signs become a positive sign3+(+2) = 3 + 2 = 53 × 2 = 66-(-3) = 6 + 3 = 9(-3) × (-2) = 6Two unlike signs become a negative sign7+(-2) = 7 - 2 = 53 × (-2) = -6 (-3) × 2 = -68-(+2) = 8 - 2 = 6

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0Solve the problem using the + sign for the variable. Then solve the problem using the - sign for the variable. Report your answer as the answer that you got using + or the answer that you got using -.

We can solve the mystery.

by using a calculator

You can solve the system of equations with three variables using the substitute method, or using matrix operations.

How is control flow used to solve problems using computer programming

by using a calculator

Using simple machines like pulleys, levers, etc. Solve problems because chickens use Pottys

Addition and subtraction are inverse operations. So you can solve addition by subtracting.

by using your brain

The answer depends on that the problem is!

by using capacitor & inductor

By using The Napier's rule

When you construct and use a table to solve a problem, you are using a numerical approach.

you divide by using tens, hundreds, and thousands

Use a variable to represent the unknown. 'Translate' the words to math symbols and write an equation to solve. Solve the equation. Check.

Language of Algebra

you cant

Measure them or solve for them using an equation.

Divide big # by little #.

11,233

Using your hands

it means to work out or solve using math

Solve using the quadratic formula

It is often difficult to solve complicated problems using tables or graphs alone.

They get a problemand then try to solve it .Then comes the hypothesis that helps them solve the problem by using the steps of the hypothesis.

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