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Posted by **Mayank** on Monday, July 16, 2012 at 2:33am.

3x + 7y + 5= 0

4x - 3y - 8 = 0

Find p; if:

px + y - 1= 0

- Math -
**CHIMA**, Monday, July 16, 2012 at 4:17am3X+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 -
**Reiny**, Monday, July 16, 2012 at 9:11amfirst 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 -
**Ama**, Monday, February 25, 2013 at 4:31am37-32-2-47-81