Solmyr
For the following system, if you isolated x in the second equation to use the Substitution Method, what expression would you substitute into the first equation?
2x + y = 9
−x − y = −8
−8 + y
−8 − y
8 + y
8 − y
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CalebBeavers
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Well, what do you get when you isolate x in
-x-y=-8
Solmyr
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im not sure
CalebBeavers
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Well.
step 1: add y to both sides
step 2:divide both sides by -1
Solmyr
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-x -y= -8
1 1
-x = -7
CalebBeavers
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Wheres y?
-x-y=-8
add y to both sides
-x=-8-y
divide both sides by -1
x=8+y
Solmyr
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x=8+y
/1 /1
CalebBeavers
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We're finished, you substitute 8+y
Solmyr
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C