bjargo76 bjargo76
  • 28-04-2014
  • Mathematics
Answered

7x - 2 = 2y
3x = 2y - 1
Solve the system of equations by substitution.
(3/4, 13/8)(1/4, -1/8)no solutioncoincident

Answer :

Аноним Аноним
  • 14-07-2014
[tex]\left\{\begin{array}{ccc}7x-2=2y\\3x=2y-1\end{array}\right\\\\substitution:\\\\3x=7x-2-1\\3x-7x=-3\\-4x=-3\ \ \ /:(-4)\\x=\frac{3}{4}\\\\2y=7\cdot\frac{3}{4}-2=\frac{21}{4}-2=\frac{21}{4}-\frac{8}{4}=\frac{13}{4}\\2y=\frac{13}{4}\ \ \ \ /:2\\y=\frac{13}{8}\\\\Answer:x=\frac{3}{4};\ y=\frac{13}{8}.[/tex]
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