Solve the following equation by elimination method : 2x + y = 8, 2x - y = 4
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Answered by
0
Answer:
Explanation:
Notice that the
y
terms are additive inverses.
Add the two equations together to eliminate them.
2
x
+
y
=
8
...
A
2
x
−
y
=
8
...
B
A
+
B
4
x
=
16
x
=
4
If
x
=
4
,
y
=
0
We could have guessed that from looking at the equation.
In one the
y
is added and in the other
y
is subtracted, yet it does not affect the value of the equation at all. The only value of
y
that would allow this to happen would be
y
=
0
YashHax:
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