2、关于x、y的二元一次方程组{ax+by=2ax-by=4与{2x+3y=44x-5y=-6的解相同,求a、b的值
更新时间2021-10-29 21:17:26
方程组二:2x + 3y = 4,4x + 6y = 8;①
4x - 5y = -6;②
① - ②,11y = 14,y = 14/11;代入①,4x = 8 - 6 * 14/11,x = 1/11;
方程组一:两式相加,2ax = 6,a = 3/x = 3/(1/11) = 33;
两式相减,2by = -2,b = -1/y = -1/(14/11) = -11/14 。
a = 33,b = -11/14 。
相关标签:方程