anonymous
  • anonymous
A student is trying to solve the set of two equations given below: Equation A: x + z = 6 Equation B: 3x + 2z = 1 Which of the following is a possible step used in eliminating the z-term? A. Multiply equation A by -2 B. Multiply equation b by 2 C.Multiply equation A by 3 D.Multiply equation b by 3
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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mathmale
  • mathmale
Think: 'If I can change one of the equations so that the coefficient of the z term is the same as the coeff. of z in the other term, except for sign, then I can add the two equations together and thus eliminate z."
anonymous
  • anonymous
So will it be A?
mathmale
  • mathmale
Did you see the "except for sign" in my previous comment?

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anonymous
  • anonymous
yes but im still a little confused
anonymous
  • anonymous
if I get it wrong I get it wrong thanks any way though
mathmale
  • mathmale
The goal here is to eliminate z. What is -2z + 2z ? What is 2x - 2z? How can you change the first equation so that z will cancel out from this system of two equations?
anonymous
  • anonymous
- 2z ?
anonymous
  • anonymous
ITS OK
mathmale
  • mathmale
Multiply the first equation bhy -2. No point in multiplying it by -2z, because z already appears in the equation. So, now, can you select the correct answer?

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