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anonymous

  • 4 years ago

how do you work out #11

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  1. anonymous
    • 4 years ago
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  2. campbell_st
    • 4 years ago
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    solve simultaneously x + y = 26 3x + 2y = 60 x = 8, y = 18

  3. anonymous
    • 4 years ago
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    how did you get the x and y so quickly, how did you know 8 and 18?

  4. campbell_st
    • 4 years ago
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    well you have 2 equations double equation 1 and then subtract it from equation 2... this will eliminate y 3x + 2y = 60 - 2x + 2y = 52 subtracting each term x = 8 is the solution... then sub into the equation x + y = 26.. and y has to be 18... its called solving simultaneous equations...

  5. anonymous
    • 4 years ago
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    would you please show me your work?

  6. anonymous
    • 4 years ago
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    im trying to follow, sorry im new at this

  7. campbell_st
    • 4 years ago
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    let x be the 1st number and y the second... the question said the sum of the 2 numbers was 26 so x + y = 26 it also said 3 times the smaller plus 2 times the larger is 60 3x + 2y = 60 then solve as above

  8. anonymous
    • 4 years ago
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    can you always double the equation one and subtract it from the other?

  9. anonymous
    • 4 years ago
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    campbell? can you always double the equation one and subtract it from the other?

  10. anonymous
    • 4 years ago
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    you doubled it to get 2y so you could solve for y, right? I think I get it.

  11. campbell_st
    • 4 years ago
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    yes.. you choose an operation that allows you to eliminate a pronumeral

  12. anonymous
    • 4 years ago
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    in order to get rid of y you had to double everything in the second equation and then ....awesome

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