1. $\left\{\begin{array}{l l} x+y=7,\\ 3x-y=1 \end{array}\right.$
2. Определите количество решений системы $\left\{\begin{array}{l l} x^2+y^2=16,\\ y+x^2-5=0 \end{array}\right.$
3. $\left\{\begin{array}{l l} x-4y-2=0,\\ xy+2y=8 \end{array}\right.$
4. $\left\{\begin{array}{l l} 3x-y=5,\\ 3x^2+y^2=13 \end{array}\right.$
5. $\left\{\begin{array}{l l} \displaystyle\frac{x+y}{8}+\frac{x-y}{6}=4,\\ \displaystyle\frac{3x+y}{4}-\frac{2x-5y}{3}=5 \end{array}\right.$
6. Определите количество решений системы $\left\{\begin{array}{l l} \displaystyle\frac{x}{2}-\frac{y}{2}=1,5,\\ 3x-3y=-9 \end{array}\right.$
7. $\left\{\begin{array}{l l} x^2-10xy+25y^2=9,\\ x+5y=7 \end{array}\right.$
8. $\left\{\begin{array}{l l} 2x+5xy=14,\\ y-5xy=-9 \end{array}\right.$

Ответы

1. (2;5)
2. 4
3. (-6;-2),(6;1)
4. (1/2;-7/2), (2;1)
5. (14;2)
6. 0
7. (5;0,4), (2;1)
8. (2;1), (0,7;3,6)