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March 31, 2015

March 31, 2015

Posted by **KiKi** on Sunday, March 28, 2010 at 8:17pm.

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? -
**Michael**, Sunday, March 28, 2010 at 8:21pmYou are correct KiKi. y= -6

- Math- CAN SOMEONE PLEASE CHECK MY WORK? -
**DrBob222**, Sunday, March 28, 2010 at 8:27pmI 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? -
**Louise**, Sunday, March 28, 2010 at 9:43pmYou 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? -
**DrBob222**, Sunday, March 28, 2010 at 11:05pmThe 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? -
**Anonymous**, Sunday, February 16, 2014 at 7:44pm0y-5-5y=6y-6-26

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