Find algebraically in RxR using substituting method the S.S. of the two equations: X + y = 4 , 2 x – y = 5

Question

Find algebraically in RxR using substituting method the S.S. of the two equations:
X + y = 4
,
2 x – y = 5

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Melody 1 week 2021-11-20T18:34:39+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-11-20T18:36:12+00:00

    Answer:

    x=3 y=1

    Step-by-step explanation:

    x+y=4

    y=-x+4

    plug in the y

    2x-(-x+4)=5

    2x+x-4=5

    3x=9

    x=3

    plug in x=3 into first equation to find y

    y=-(3)+4

    y=-3+4

    y=1

    0
    2021-11-20T18:36:13+00:00

    Answer:

    Step-by-step explanation:

    x + y = 4   equation 1

    2x – y = 5  equation 2

    using substitution method,

    x= 4 – y  equation 3

    substitute equation 3 into equation 2

    2(4-y) -y = 5

    8 – 2y – y = 5

    8 – 3y = 5

    -3y = 5 – 8

    -3y = -3

    divide through by -3

    -3y/-3 = -3/-3

    y = 1

    substitue the value of y into equation 1

    x + y = 4

    x + 1 = 4

    x = 4 – 1

    x = 3

    Hence, x = 3 and y = 1

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