Math

5x - 3 = 7x + 11
x=-4

3w -4 = w+8
w =6

Please check. Thanks

asked by David
  1. Let's substitute.

    (5 * -4) - 3 = (7 * -4) + 11
    -20 - 3 = -28 + 11
    -23 = - 17
    Nope. That doesn't work.

    (3 * 6) - 4 = 6 + 8
    18 - 4 = 14
    14 = 14
    Yep. This one works!

    posted by Ms. Sue
  2. 5x - 3 = 7x + 11
    x=-4 <------------ No

    5x-7x = 11+3
    -2x = 14
    x = -7

    3w -4 = w+8
    w =6 < --------- Yes

    posted by Reiny

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