(-2-x-2y) (2+x+2y)
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Answer:
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Step-by-step explanation:
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Answer:
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Algebra
Solve by Substitution
Solve for the first variable in one of the equations, then substitute the result into the other equation.
x
=
2
−
2
y
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Solve by Substitution
x
+
2
y
=
2
,
−
x
−
2
y
=
−
2
Subtract
2
y
from both sides of the equation.
x
=
2
−
2
y
−
x
−
2
y
=
−
2
Replace all occurrences of x in −x−2y=−2 with 2−2y.
x=2−2y−(2−2y)−2y=−2
Simplify
−(2−2y)−2y.
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x=2−2y−2=−2
Since
−2=−2
, the equation will always be true.
x=2−2y
Always true
Remove any equations from the system that are always true.
x=2−2y