○39.1. а) $$ \left\{\begin{array}{l}x-y=5, \ x+y=7 ;\end{array} ight. $$ б) $$ \left\{\begin{array}{l}x+y=9, \ -x+y=-3 ;\end{array} ight. $$ ०39.2. а) $$ \left\{\begin{array}{l}2 x+11 y=15, \ 10 x-11 y=9 ;\end{array} ight. $$ б) $$ \left\{\begin{array}{l}9 y+13 x=35, \ 29 y-13 x=3 ;\end{array} ight. $$ ०39.3. а) $$ \left\{\begin{array}{l}x+y=7, \ x-3 y=-5 ;\end{array} ight. $$ б) $$ \left\{\begin{array}{l}4 x-y=3, \ x-y=6 ;\end{array} ight. $$

Question

○39.1. а) $$ \left\{\begin{array}{l}x-y=5, \ x+y=7 ;\end{array}ight. $$ б) $$ \left\{\begin{array}{l}x+y=9, \ -x+y=-3 ;\end{array}ight. $$ ०39.2. а) $$ \left\{\begin{array}{l}2 x+11 y=15, \ 10 x-11 y=9 ;\end{array}ight. $$ б) $$ \left\{\begin{array}{l}9 y+13 x=35, \ 29 y-13 x=3 ;\end{array}ight. $$ ०39.3. а) $$ \left\{\begin{array}{l}x+y=7, \ x-3 y=-5 ;\end{array}ight. $$ б) $$ \left\{\begin{array}{l}4 x-y=3, \ x-y=6 ;\end{array}ight. $$

Lewis Hodgson · Accepted Answer

### 39.1 а) $$x = 6, y = 1$$ б) $$x = 6, y = 3$$ ### 39.2 а) $$x = 2, y = 1$$ б) $$x = 2, y = 1$$ ### 39.3 а) $$x = 4, y = 3$$ б) $$x = -1, y = -7$$

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