Solve each system by elimination 6x+3y=21 -12x+y=-7

Question

Solve each system by elimination

6x+3y=21
-12x+y=-7

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Rose 1 week 2021-09-14T17:56:11+00:00 2 Answers 0

Answers ( )

    0
    2021-09-14T17:57:15+00:00

    Answer:

    x=1,y=5

    Step-by-step explanation:

    6x+3y=21….(1)

    -12x+y=-7…..(2)

    From (2) make y the subject of formula

    y=-7+12x…(3)

    Substitute (3) into (1)

    6x+3(-7+12x)=21

    6x-21+36x=21

    Collect like terms

    6x+36x=21+21

    42x=42

    Divide both sides by 42

    x=1

    Substitute the value of x into (3)

    y=-7+12(1)

    y=-7+12

    y=5

    Therefore x=1,y=5

    0
    2021-09-14T17:57:19+00:00

    Answer:

    (x,y)=(1,5)

    Step-by-step explanation:

    6x+3y=21/*2

    -12x+y=-7

    12x+6y=42 (1)

    -12x+y=-7 (2)

    (1)+(2): 7y=35

    -12x+y=-7

    y=35/7

    -12x+y=-7

    y=5

    -12x+5=-7

    y=5

    -12x=-7-5

    y=5

    -12x=-12

    y=5

    x=-12/(-12

    y=5

    x=1

    (x,y)=(1,5)

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