Mathematics
Junior High
この計算の代入法で解いた式を教えて下さい🙏
14 )
(2)
-3y
y=5
11
x+
100°
x-y=8
9
100y=-1 ......①
-11x+9y=-100
9x-9y=72
=-28
x=14
(x, y) = (
1×100
2×9
+)
- 2x
x=14を②に代入すると,
14-y=8
-y=-6
y=6
(x, y)=(14, 6)
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