Gokuporter
  • Gokuporter
http://prntscr.com/9atj8r
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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nikato
  • nikato
there are two ways to solve it. substitution or elimination. do you have a preference?
Gokuporter
  • Gokuporter
Substitution
nikato
  • nikato
but i think substitution would be easier. 2x+3y= -6 x-y=4

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nikato
  • nikato
you can start by adding y to both sides in the second equation and you'll get ... ?
Gokuporter
  • Gokuporter
How do you add both sides?
nikato
  • nikato
|dw:1449363994185:dw| since -y+y=0
Gokuporter
  • Gokuporter
So x=4y?
nikato
  • nikato
no. just x=4+y we're not multiplying
Gokuporter
  • Gokuporter
Oh ok
Gokuporter
  • Gokuporter
So what next?
nikato
  • nikato
so now whever you see x in the first eequation you substitute with y+4
Gokuporter
  • Gokuporter
Ok
nikato
  • nikato
|dw:1449364657497:dw| ok?
Gokuporter
  • Gokuporter
So how do you do 2(4 + y)?
nikato
  • nikato
do you know how to distribute
nikato
  • nikato
ex. a(x+y)= ax +ay
nikato
  • nikato
|dw:1449365522394:dw| ok?
Gokuporter
  • Gokuporter
Yes
Gokuporter
  • Gokuporter
8 + 5y= -6
Gokuporter
  • Gokuporter
What's next?
nikato
  • nikato
subtract 8 on both sides. divde by 5 on both sides to solve for y
Gokuporter
  • Gokuporter
-2.8?
Gokuporter
  • Gokuporter
@nikato
nikato
  • nikato
yes. but it tells you to round to neaerest integer. and that would be -3
nikato
  • nikato
to find x, use the second equation. x-y=4 since you know y=-3 just plug that into the equation to solve for x
nikato
  • nikato
|dw:1449368511066:dw|
Gokuporter
  • Gokuporter
-3
Gokuporter
  • Gokuporter
-6
Gokuporter
  • Gokuporter
@nikato
Gokuporter
  • Gokuporter
@SolomonZelman
SolomonZelman
  • SolomonZelman
2x+3y= -6 x-y=4 2x+3y= -6 3x-3y=12 5x=6 x=6/5 x-y=4 6/5-y=4 6/5-4=y 6/5-20/5=-14/5=y
Gokuporter
  • Gokuporter
1.2?
SolomonZelman
  • SolomonZelman
1.2 ... is what?
Gokuporter
  • Gokuporter
x=1.
SolomonZelman
  • SolomonZelman
well, that isn't what I get..
SolomonZelman
  • SolomonZelman
maybe the question is different?
Gokuporter
  • Gokuporter
What do you get?
SolomonZelman
  • SolomonZelman
x=6/5 (I showed this) or, =1.2
SolomonZelman
  • SolomonZelman
(but you said x=1)
Gokuporter
  • Gokuporter
So (1.2,-3)
Gokuporter
  • Gokuporter
@SolomonZelman
mathmale
  • mathmale
Please read the instructions for this problem carefully. You are supposed to ESTIMATE the solution by reading off x- and y-values from the given graph. Look for the point at which the 2 lines intersect. At this point, x is close to which integer? y is close to which integer?

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