milliefarrell1 milliefarrell1
  • 04-02-2015
  • Mathematics
Answered

3x+2y=4
4x+5y=17
What is the value of x and y?

Answer :

eu99li
eu99li eu99li
  • 04-02-2015
{3x+2y=4    /*5
{4x+5y=17    /*(-2)

{15x+10y=20
{-8x-10y=-34        (+)
7x=-14
x=-2

15x+10y=20
15*(-2)+10y=20
-30+10y=20
10y=50
y=5

Answer Link
konrad509
konrad509 konrad509
  • 04-02-2015
[tex]3x+2y=4|\cdot(-4)\\ 4x+5y=17|\cdot 3\\\\ -12x-8y=-16\\ \underline{12x+15y=51}\\ 7y=35\\ y=5\\\\ 3x+2\cdot5=4\\ 3x+10=4\\ 3x=-6\\ x=-2\\\\ \boxed{(x,y)=(-2,5)}[/tex]
Answer Link

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