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18 November, 20:59

Solve the following systems algebraically

a. x+2y=17

x-y=2

+2
Answers (1)
  1. 18 November, 23:55
    0
    There are 3 methods to solve this. elimination substitution and graphing but i am going to use the elimination method.

    x+2y=17

    x-y = 2

    0+3y = 15 (subtracted down to eliminate the x) (x-x=0, 2y - (-y) = 3y, and 17-2=15)

    3y=15 (divide both sides by 3 to solve for y)

    y=5

    substitute the y=5 in any of the above equations and solve for x

    ie ... (meaning where you find y in the equation, u replace it with a 5)

    it will be easier to solve for x in (x-y=2) so i will use that one.

    x - (5) = 2 (add 5 on both sides to solve for x)

    x=7
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