2x加3y等于36,4x加2y等于56求x.y

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2x加3y等于36,4x加2y等于56求x.y2x加3y等于36,4x加2y等于56求x.y2x加3y等于36,4x加2y等于56求x.y2x+3y=36…………①4x+2y=56…………②②×3-①

2x加3y等于36,4x加2y等于56求x.y
2x加3y等于36,4x加2y等于56求x.y

2x加3y等于36,4x加2y等于56求x.y
2x+3y=36…………①
4x+2y=56…………②
②×3-①×2得
8x=96
x=12
把x=12带入①得
24+3y=36
3y=12
y=4
∴x=12,y=4

2x + 3y = 36 ①
4x + 2y = 56 ②
①x 2 = 4x + 6y = 72 ③
③ - ① = 4y = 72 - 56
4y = 16
y = 4
将y=4 代入①式中
x = 12
所以 x = 12
y = 4