Question:

Eliminaton-Algebra I

by Guest5333  |  12 years, 9 month(s) ago

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I dont seem to understand how to solve a linear question by using elimination could yo please help me understand more by using this example.
3x+15y=30
2x+4y=11

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  1. GiGi
    3x + 15y = 30 ---> eq.1
    2x + 4y = + 11 ---> eq.2       (Eliminating eq 1 from eq 2)
    -----------------
    x + 11y = 19  ---> eq.3

    x = 19 - 11y     ---> 1
    y = 19 -x / 11   ---> 2

    putting the value of x in eq.1, we get

    3(19 - 11y) + 15 y = 30
    57 - 33y + 15 y = 30
    57 - 18 y = 30
    18y = 57 - 30
    y = 27 / 18

    y = 3 / 2
    y = 1.5

    putting the value of y in eq. 2

    2x + 4y = 11
    2x + 4(3/2) = 11
    2x + 2(3) = 11
    2x + 6 = 11
    2x = 5
    x = 5/2
    x =2.5


    by putting x and y value in any equation u can verify that the value of x and y is correct....

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