Stephanym829 Stephanym829

26-03-2015
Mathematics

contestada

Systems of equations. What are the two solutions with work?

y=x^2-5x-4

y=-2x

Respuesta :

Panoyin Panoyin

04-04-2015

y = x² - 5x - 4
y = -2x

-2x = x² - 5x - 4
+ 5x     + 5x
   3x = x² - 4
     0 = x² - 3x - 4
   0 = x² - 4x + x - 4
   0 = (x + 1)(x - 4)
   0 = x + 1 or 0 = x - 4
   - 1    - 1    + 4 + 4
    -1 = x    4 = x

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