syms x y;exp = 6*x+8*y-7*x*y;y = solve(exp,'y')x = 0.05y = subs(x)
y =
6*x/(-8+7*x)
x =
0.0500
可这样：syms x yy=solve(7*x*y==6*x+8*y,y)结果是：y = (6*x)/(7*x - 8)
已知了x的值，y就是一元一次方程了吧。。。
