Решите систему уравнений способом подстановки

5) $\left \ x + 5y = -2 \atop 0.5x - y = 6 \right. \\amp;10; \left \ x + 5y = -2 \atop 0.5x = 6 + y \right. \\amp;10; \left \ x + 5y = -2 \atop x = 12 + 2y \right. \\amp;10; \left \ 12 + 2y + 5y = -2 \atop x = 12 + 2y \right. \\amp;10; \left \ 7y= -14 \atop x = 12 + 2y \right. \\amp;10; \left \ y= -2 \atop x = 12 - 4 \right. \\amp;10; \left \ y= -2 \atop x = 8 \right. \\$

6) $\left \ 12x - y = 18 \atop x + 0.5y = 5 \right. \\amp;10; \left \ 12x - y = 18 \atop 0.5y = 5 - x \right. \\amp;10; \left \ 12x - y = 18 \atop y = 10 - 2x \right. \\amp;10; \left \ 12x - 10 + 2x = 18 \atop y = 10 - 2x \right. \\amp;10; \left \ 14x = 28 \atop y = 10 - 2x \right. \\amp;10; \left \ x = 2 \atop y = 10 - 2x \right. \\amp;10; \left \ x = 2 \atop y = 10 - 4 \right. \\amp;10; \left \ x = 2 \atop y = 6 \right. \\$
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Решите систему уравнений способом подстановки

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