noahbred
  • noahbred
how do i find solve x Evaluate if x = –4 and y = 13. 3(2x – y) A. 90 B. 82 C. –15 D. –63
Mathematics
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SOLVED
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katieb
  • katieb
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sloppycanada
  • sloppycanada
Alright first step is to insert your values for x and y.
sloppycanada
  • sloppycanada
3(2(-4)-13)
sloppycanada
  • sloppycanada
Now because we have 2(-4) or 2(x) we want to simplify that bit. 2 * -4 = -8 rewriting our equation... 3(-8-13) = ? Are you following so far?

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sloppycanada
  • sloppycanada
From there, we're going to follow the rules we learned last question. PEMDAS. (used to know a rhyme for this.. kinda forgot it now) -8 -13 = -21 3(-21) = ?
UsukiDoll
  • UsukiDoll
you mean please excuse me dear aunt sally ?
sloppycanada
  • sloppycanada
No.. there was a different one. It involved cookies.
noahbred
  • noahbred
does this 1 invole negetive numbers?
sloppycanada
  • sloppycanada
Yes. 3(-21) = ? Whatever "?" happens to be is your answer.
noahbred
  • noahbred
-18 yah
sloppycanada
  • sloppycanada
Except your answer is not -18.
noahbred
  • noahbred
oohh i got itt
sloppycanada
  • sloppycanada
Parenthesis means me multiply unless told otherwise. And?
noahbred
  • noahbred
90
UsukiDoll
  • UsukiDoll
O_O
sloppycanada
  • sloppycanada
What? no.
sloppycanada
  • sloppycanada
3(-21) = -63. You multiply 3 x -21
noahbred
  • noahbred
-63
noahbred
  • noahbred
ommg i feel like a idiot
skullpatrol
  • skullpatrol
|dw:1449743705153:dw|

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