Find the solution of this system of equations 4x + y = 3 4x – y = -5

Question

Find the solution of this system of equations
4x + y = 3
4x – y = -5

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Madeline 2 weeks 2021-09-08T17:02:30+00:00 2 Answers 0

Answers ( )

    0
    2021-09-08T17:03:45+00:00

    Answer:

    y = 7/2

    x = -1/8

    Step-by-step explanation:

    4x + y = 3———–eqn 1

    4x – y = -5———-eqn 2

    Let’s pick eqn 1

    4x + y = 3

    Let’s make y the subject of the formula

    y = 3 -4x

    Since y = 3 – 4x, substitute the value of y into eqn 2

    4x – ( 3 – 4x) = -5

    Using the – to open the bracket

    4x – 3 + 4x = -5

    16x – 3 = -5

    16x = -5 + 3

    16x = -2

    Divide through by 16 to get the value of x

    16x/ 16 = -2/16

    x = -1/8

    Since we’ve gotten the value for x, find y using eqn 1

    4x + y = 3

    4(-1/8) + y = 3

    -4/8 + y = 3

    y = 3 + 4/8

    LCM is 8

    y = 24 + 4 / 8

    y = 28/8 ( using 4 to divide)

    y = 7/2

    x = -1/8

    y = 7/2

    0
    2021-09-08T17:03:52+00:00

    -1/4 is the answer.

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45:7+7-4:2-5:5*4+35:2 =? ( )