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4 years ago

Solve the system x - 2y = -6 3x + y = -4

Mathematics

1 answer:

stepan [7]4 years ago

5 0

{x-2y=-6

{3x+y=-4 /*2

{x-2y=-6

{6x+2y=-8 (+)

7x=-14 /:7

x=-2

3x+y=-4

3*(-2)+y=-4

-6+y=-4

y=2

Solution: (-2; 2)

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$\dfrac{1}{4}\ \text{and }\dfrac{1}{5} \ \rightarrow \ \dfrac{1 \times 40}{4 \times 40} \ \text{and} \ \dfrac{1 \times 32}{5 \times 32} \ \rightarrow \ \dfrac{40}{160} \ \text{and} \ \dfrac{32}{160}$

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