system of equations amanda bought 9 shirts for a total of 69$ Tee shirts cost 7$ and long sleeve shirts cost 8$ how many of each type did sh

Question

system of equations amanda bought 9 shirts for a total of 69$ Tee shirts cost 7$ and long sleeve shirts cost 8$ how many of each type did she buy

in progress 0
Ladonna 3 years 2021-08-12T20:55:57+00:00 1 Answers 1 views 0

Answers ( )

  1. ngocdiep
    0
    2021-08-12T20:57:27+00:00
    Reply

    9514 1404 393

    Answer:

    • 6 shirts at $8
    • 3 shirts at $7

    Step-by-step explanation:

    Let x and y represent the numbers of $8 and $7 shirts, respectively. Your system of equations can be written …

      x + y = 9

      8x +7y = 69

    Subtracting 7 times the first equation from the second gives …

      (8x +7y) -7(x +y) = (69) -7(9)

      x = 6

    Then y is …

      y = 9 -x = 9 -6 = 3

    Amanda bought 6 tees costing $8 and 3 tees costing $7.

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )