mayaduke8372 mayaduke8372
  • 16-11-2017
  • Mathematics
contestada

If you were solving by substitution, for which variable in the first equation would it be easiest to solve? 3x + y = 7 x – y = 1

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dannielle
dannielle dannielle
  • 21-11-2017
3x+y=1
7x-y=1⇒ y=7x-1

3x+(7x-1)=1
10x-1=1
10x=1+1
10x=2
x=2/10
x=0,2

3x+y=1
3*0,2+y=1
0,6+y=1
y=1-0,6
y=0,4
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