3x-y=10 система x/3-y+1/5=1 ps. снизу

Question

3x-y=10 система x/3-y+1/5=1 ps. снизу

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Answer 1

1)3x-y=10

2) x/3+(y+1)/5=1

1)9x-3y=30

+

2)5x+3y+3=15

3)14x=42

x=3

y=-1

Answer 2

{y=3x-10

{x/3-(y+1)/5=1

 

(5x-9x+27)/15=1

5x-9x+27=15

4x=12

x=3

y=-1