jass0111 jass0111
  • 23-07-2018
  • Mathematics
contestada

solve using substitution technique; -3x+y=2, 12x-4y=-8

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altavistard
altavistard altavistard
  • 23-07-2018

The first equation is easier to solve for y than is the 2nd: y = 3x+2. Subst. 3x+2 for y in the second equation:


12x - 4(3x+2) = -8

Expanding, 12x =12x -8 = -8


This is always true, no matter the value of x. Thus, the solution set is "all real numbers."

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