Find two numbers, if … b Their sum is −7 and their difference is 14

Question

Find two numbers, if … b Their sum is −7 and their difference is 14

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Kaylee 2 weeks 2021-09-14T19:01:57+00:00 1 Answer 0

Answers ( )

    0
    2021-09-14T19:03:40+00:00

    Answer:

    x=0

    y=-21/7

    Step-by-step explanation:

    Let the two unknown be x and y

    x+y=-7…(1)

    x-y=14…(2)

    From (1) make x the subject of formula

    x=-7-y…(3)

    Substitute (3) into (2)

    -7-y-y=14

    -7-2y=14

    Add 7 to both sides

    -2y=21

    Add both sides by-2

    y=-21/2

    Substitute the value of y into (3)

    x=-7-(-21/2)

    x=-7+21/3

    Lcm

    x=-21+21/3

    x=0/3

    x=0

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