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March 25, 2017

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Yesterday Lucy walked 2 hours and jogged 1/2 hour and covered 6.25 miles. Today she walked for 3 hours and jogged for 1 hour and covered 10.25 miles. Assuming a constant walking rate and a constant jogging rate, how fast did she walk and how fast did she jog? Define two variables, write a system of equations, and solve to find the walking rate and the jogging rate.

2w + .5j= 6.25 --> 3(2w+.5j)= 3(6.25)
3w + 1j= 10.25 --> -2(3w+1j)= -2(10.25

6w + 1.5j= 18.75>> -.5j=-1.75
6w + 2j= -20.50 >> j=.3

2w + .5(.3)= 6.25
2w + 15= 6.25
2w= 6.10 w= 3.05

check:
2(3.05) + .5(.3)= 6.25 (correct)
3(3.05) + 1(.3)= 9.45(wrong!!) it should be 10.25.

please tell me where im going wrong:)

  • algebra - ,

    I am lost here:
    6w + 1.5j= 18.75>> -.5j=-1.75
    6w + 2j= -20.50 >> j=.3

    I think you should have
    6w + 1.5j= 18.75>>
    -6w - 2j= -20.50 >>
    adding them,
    .5j= 1.75
    j= .35
    and w= you do it.

  • messed up,,,redo. - ,

    w- walking j- jogging
    2w + .5j= 6.25 --> 3(2w+.5j)= 3(6.25)
    3w + 1j= 10.25 --> -2(3w+1j)= -2(10.25

    6w + 1.5j= 18.75
    -6w - 2j= -20.50
    -----------------
    -.5j=-1.75
    j=.3


    2w + .5(.3)= 6.25
    2w + 15= 6.25
    2w= 6.10 w= 3.05

    check:
    2(3.05) + .5(.3)= 6.25 (correct)
    3(3.05) + 1(.3)= 9.45(wrong!!) it should be 10.25.

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