Makahanap ng mga eksaktong solusyon sa iyong mga problema gamit ang IDNStudy.com. Magtanong at makakuha ng detalyadong sagot mula sa aming komunidad ng mga eksperto na may kaalaman.

For what value of k will the system be inconsistent?

1. y=kx+2
y= -2x-3

2. 4x+y=3
kx-2y=6

3. 2x+5y= -7
x-ky=2

4. x/2 + y/5 =1
2y =kx+6


Sagot :

A.) For the system to be inconsistent, the slopes must be the same.  
B.) Convert the equations to y = mx + b (slope-intercept form).

1)  y = -2x - 3          
    m (slope) = -2
   
    y = kx + 2
    k = -2
    To check:
    y = -2x + 2
    m = -2

2)  4x + y = 3
    y = -4x + 3
    m = -4
   
    kx - 2y = 6
    -2y = -kx + 6
    k = -8
   To check:
    kx - 2y = 6
    -8x - 2y = 6
    - 2y = 8x + 6
     -2y/-2 = 8x/-2 + 6/-2
      y = -4x - 3
      m = -4

3)  2x + 5y = -7
    5y = -2x - 7
    5y/5 = -2x/5 - 7/5
    y = -2x/5 - 7/5
    m = -2/5
   
   x - ky = 2
   -ky = -x + 2
    k = -5/2
   
     To check:
    x - (-5/2)y = 2
    x + (5/2)y = 2
    (5/2)y = -x + 2
     (2/5) [(5/2)y = -x + 2] (2/5)
     y = (-2/5)x +4/5
     m = -2/5 

4.)  x/2 + y/5 = 1
     LCD: (5)(2)
     (5)(2) (x/2) + (5)(2)(y/5) = (5)(2)(1)
      5x + 2y = 10
      2y = -5x + 10
      2y/2 = -5x/2 + 10/2
      y = (-5/2)x + 5
      m = -5/2
   
      2y = kx + 6
      k = -5
     To check: 
      2y = -5x + 6
      2y/2 = -5x/2 + 6/2
      y = -5x/2 + 3
      m = -5/2