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March 29, 2017

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Solve:
3x + 7y + 5= 0
4x - 3y - 8 = 0

Find p; if:
px + y - 1= 0

  • Math - ,

    3X+7Y+5=0.,..,..,.,..(1)
    4X-3Y-8=0..,,..,.,...,..(2)
    From (1) x=(-5-7y)/3..,..,..(3) put into equ (2) for x ; (-20-28y)/3-8=0 ; y=31/28=1.1 put into equ 3 for y
    x=(-5-7.7)/3=-4.2
    -4.2p +1.1-1=0 ; p=-0.1/-4.2
    p=0.024

  • Correction - Math - ,

    first times 3 ---> 9x + 21y = -15
    2nd times 7 ---> 28x - 21y = 56
    add them
    37x = 41
    x = 41/37

    sub into 1st:
    3(41/37) + 7y = -5
    7y = -5 - 123/37 = -308/37
    y = -44/37

    then if px + y = 1
    p(41/37) - 44/37 = 1
    p = (1 + 44/37)(37/41) = 81/41

    I verified the above answers, they satisfy the original equations.

  • Math - ,

    37-32-2-47-81

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