Posted by
Mayank on
.
Solve:
3x + 7y + 5= 0
4x  3y  8 = 0
Find p; if:
px + y  1= 0

Math 
Shen,
3x+7y=5 (i)
4x3y=8 (ii)
(i)x 4:
12x+28y=20 (iii)
(ii)x 3:
12x9y=24 (iv)
(iv)(iii):
37y=44
y=44/37
subs y into (i):
3x+7(44/37)=5
3x= 5+308/37
x=148/37

Math  fix 
Steve,
3x = 185/37 + 308/37 = 123/37
x = 41/37