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14 September, 21:50

Solve each system of equation by substitution

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  1. 14 September, 22:18
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    You substitute in an expression by filling in the desired and accustomed unknown value to the value you're trying to find. An example below can better elaborate what I want to say above. In the equation below, 7 - 2n = 5 the unknown is represented by n moreover, the equation suggest to find the missing to make it equilateral on both sides.

    In mathematical expression, the equation then becomes 7 - 2n = 5

    The next procedure is to find the unknown.

    1. 7 - 2n = 5

    2. - 2n = 5 - 7

    3. - 2n = - 2

    4. n = - 2/-2

    5. n = 1

    Check:

    Substitute n = 1

    7 - 2 (1) = 5

    7-2 = 5

    5=5
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