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Math- CAN SOMEONE PLEASE CHECK MY WORK?

posted by on .

7x+5y=-26
x=28-6y

solve using substitution

okay so then 196-42y+5y=-26
then combined like terms so
196+37y=-26
37y=-222
y=-6 is this part correct?

  • Math- CAN SOMEONE PLEASE CHECK MY WORK? - ,

    You are correct KiKi. y= -6

  • Math- CAN SOMEONE PLEASE CHECK MY WORK? - ,

    I believe that is a +6 and most would prefer that you put in another step.
    like so:
    7(28 - 6y) + 5y = -26, then
    196 -42y + 5y = -26
    -37y = -222
    y=+6

  • Math- CAN SOMEONE PLEASE CHECK MY WORK? - ,

    You are correct. The answer is -6.
    7(28-6y)+5y=-26
    196-42y+5y=-26
    37y=-222
    37y/37=-222/37
    y=-6

  • Math- CAN SOMEONE PLEASE CHECK MY WORK? - ,

    The answer is not -6, it is +6.
    Both Louise and Michael subtracted incorrectly.
    7(28-6y) + 5y = -26
    196-42y + 5y = -26
    (-42y + 5y is -37y; therefore)
    196 - 37y = -26-196 = -222
    -37y= -222 and
    y=(-222/-37) = +6.

    Solve for x now.
    x = 28-6y
    x = 28-6(+6)
    x = 28-36
    x - -8.

    Now substitute x = -8 and y = +6 into the first equation.
    7x + 5y = -26
    7(-8) + 5(+6) = -26
    -56 + 30 = -26
    -26 = -26
    Substitute -6 and it won't work.

  • Math- CAN SOMEONE PLEASE CHECK MY WORK? - ,

    0y-5-5y=6y-6-26

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