saucvi
  • saucvi
Question about system of equations: for equivalent system of equations if both equations start with a negative, what do you multiply? Do the numbers stay negative?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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saucvi
  • saucvi
Example: -3x + 7y =-16 -9x + 5y = 16 how would you get an equivalent system of equations for that?
Mertsj
  • Mertsj
Multiply the top equation by -3
saucvi
  • saucvi
9x + -27y = 48 ?

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Mertsj
  • Mertsj
-3(7)=-21
Mertsj
  • Mertsj
Better learn you multiplication tables, sonny.
saucvi
  • saucvi
I'm not understanding this at all.
Mertsj
  • Mertsj
What don't you understand about multiplying 3and 7 to get 21 and NOT 27?
saucvi
  • saucvi
I don't understand why you multiplied 7 by -3 in the first place. I thought you multiply each variable to get an equivalent.
Mertsj
  • Mertsj
To solve a system of equations you want to make the coefficients of either x or y to be opposites.
Mertsj
  • Mertsj
If you multiply the first equation by -3 you will get 9x.
Mertsj
  • Mertsj
In the second equation you have -9x
Mertsj
  • Mertsj
9 and -9 are opposites.
saucvi
  • saucvi
Oh okay. I think I understand most of it now. Thanks. I appreciate it.

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