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

I.
3x + 7y + 5 = 0
4x  3y  8 = 0
To solve, we can either use substitution or elimination method. For substitution, we choose one equation and represent one variable in terms of the other. Let's choose the first equation, and represent x in terms of y:
3x + 7y + 5 = 0
3x = 7y  5
x = (7/3)y  5/3
then we substitute this to the 2nd equation:
4x  3y  8 = 0
4[(7/3)y  5/3]  3y  8 = 0
(28/3 y  20/3  3y  8 = 0)*3
28y  20  9y  24 = 0
37y = 44
y = 44/37
substituting this back to either equations and solving for x,
x = 41/37
II.
px + y  1= 0
px = 1  y
p = (1y)/x
hope this helps~ :)