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( unknown numbers).

Any value of the variable that satisfies the given equation is called a

1) Add the same number on both sides of the equation.

2) Subtract the same number from both sides of the equation.

3) Multiply both sides of the equation by the same non-zero number.

4) Divide both sides of the equation by the same non-zero number.

These rules are applied in such a way that on one side there should be only a variable.

The equality symbol (=) in the equation remains unchanged.

x + 5 = 12 As there is + 5 so use opposite operation and add -5 on both sides. x + 5 = 12 - 5 = - 5 -------------------- x = 7 Check : For x = 7;Left side = 7 + 5 = 12 = Right side |
x - 5 = 12 As there is - 5 so use opposite operation and add +5 on both sides. x - 5 = 12 + 5 = + 5 -------------------- x = 17 Check : For x = 17;Left side = 17 - 5 = 12 = Right side |

4m = 16 As there is 4 times m so divide both side by 4. 4m 16 ---- = ----- 4 4 m = 4 Check : For m = 4 ; Left side = 4 x 4 = 16 = Right side. |
m ----- = 16 4 As there is m over 4 (division) So multiply both side by 4 m 4 x ------ = 16 x 4 4 m = 64 Check : For m = 64 Left side = 64 / 4 = 16 = Right side |

• Linear Equation in One Variable

• Algebraic Equations with Fractions

• Algebra Word Problems

• Algebra Rate (upstream and downstream) Problems

• Algebra Age Problems

• Algebra Digit Problems

8th grade math

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