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22 March, 19:59

Which ordered pair in the form (a, b) is a solution of this equation?

7a - 5b = 28

1. 0,4

2. 4,0

3. - 3,-2

4. - 2,-3

+3
Answers (1)
  1. 22 March, 21:03
    0
    You can figure out the answer to this by plugging in each set of coordinates into the equation and solving.

    7a - 5b = 28 Plug in the coordinates

    1. 7 (0) - 5 (4) = 28 Multiply

    0 - 20 = 28 Subtract

    -20 ≠ 28

    2. 7 (4) - 5 (0) = 28 Multiply

    28 - 0 = 28 Subtract

    28 = 28

    3. 7 (-3) - 5 (-2) = 28 Multipy

    -21 - - 10 = 28 Simplify the double negative

    -21 + 10 = 28 Add

    -11 ≠ 28

    4. 7 (-2) - 5 (-3) = 28 Multiply

    -14 - - 15 = 28 Simplify the double negative

    -14 + 15 = 28 Add

    1 ≠ 28

    As you can see, the only set of coordinates that worked was 2. (4, 0).
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