17．解下列方程组:(1)$\left\{\begin{array}{l}{x-2y=0}\\{3x+4y=10}\end{array}\right.$, (2)$\left\{\——青夏教育精英家教网——

17．解下列方程组：
（1）$\left\{\begin{array}{l}{x-2y=0}\\{3x+4y=10}\end{array}\right.$；
（2）$\left\{\begin{array}{l}{\frac{x-1}{3}-\frac{y+2}{4}=0}\\{\frac{x-3}{4}-\frac{y-3}{3}=\frac{1}{12}}\end{array}\right.$．

16．若P（x，y）满足方程组$\left\{\begin{array}{l}{x-y=a+3}\\{2x+y=5a}\end{array}\right.$．
（1）若P在第四象限，求整点（横、纵坐标均为整数的点）Q（$\frac{1}{2}$a-3，2a）的坐标．
（2）若P在第三象限，解关于x的不等式a（x-2）＜4a．

15．已知方程组$\left\{\begin{array}{l}y-2x=m\\ 2y+3x=m+1\end{array}$的解x，y满足x+3y=3，求m的值．

14．用合适的方法解方程组：
（1）$\left\{\begin{array}{l}y=x+3\\ 7x+5y=9\end{array}\right.$（2）$\left\{\begin{array}{l}3x+4y=16\\ 5x-6y=33\end{array}\right.$．

13．已知方程组 $\left\{\begin{array}{l}3x+y=11\\ mx+ny=9\end{array}\right.$与$\left\{\begin{array}{l}2x+3y=12\\ mx-ny=-3\end{array}\right.$有相同的解，求m，n 的值．

12．解不等式组$\left\{\begin{array}{l}3x-1＞2x+1\\ 2x≤8\end{array}\right.$，并写出整数解．

11．解方程组$\left\{\begin{array}{l}2x+3y=1\\ 3x+5y=2\end{array}\right.$．

10．解方程组$\left\{\begin{array}{l}x+y=7\\ 3x+y=15\end{array}\right.$．

9．解方程：3x-7=-2x+3．

8．不等式组$\left\{\begin{array}{l}{4x-10≥x+2}\\{3x-2＞1}\end{array}\right.$的解集是x≥4．

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