anonymous
  • anonymous
Using elimination to solve the system 2x + y = 8 and x + y = 4, which of the following could be the first step? A. 2x + y = 8--------> 2x + y = 8 (x + y = 4)(-1)---> -x - y = -4 B. 2x + (4 - x) = 8 C. 2x + y = x + y D. 3x + 2y = 12 E. x = 4
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
x = 4, y = 0
anonymous
  • anonymous
So E ?
anonymous
  • anonymous
nope

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campbell_st
  • campbell_st
2x + y = 8 (1) x + y = 4 (2) double equation 2 and subtract it from equation 1 2x + y = 8 - 2x +2y = 8 --------------- -y = 0 so y = 0 sub into equation 2 to find x x = 4
anonymous
  • anonymous
2x + y = 8--------> 2x + y = 8
anonymous
  • anonymous
so answer is A
anonymous
  • anonymous
Alexis, keep asking. I wanna answer XD
anonymous
  • anonymous
yes, answer is A. this is a Didactic question, just to make sure u understand the steps in eliminating one variable. bear in mind you have to subtract (x-x, y-y) equations in order to obtain a third one with a single variable in it

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