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
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
Solve 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 -.
you cant
yes
By using algebra.
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Solve 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
it is often difficult to solve complicated problems alone
Addition and subtraction are inverse operations. So you can solve addition by subtracting.
469.38 - 124.93 - 99.37
by using your brain
By using The Napier's rule
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