Question

3x + 2y = 7 .... (1)

5x – 2y = 9 .... (2)



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Answer 1

Respuesta:

3x-2y=9 (I)

5x+2y=7 (II)

_____________

8x=16

x=2

3x-2y=9 (I)

3(2)-2y=9

2y=9-6

Answer 2

Respuesta:

$x = 2 \\ y = \frac{1}{2}$

Explicación paso a paso:

$y = \frac{7}{2} - \frac{3}{2} x$

$y = - \frac{9}{2} + \frac{5}{2} x$

$\frac{7}{2} - \frac{3}{2} x = - \frac{9}{2} + \frac{5}{2} x \\ \frac{7}{2} + \frac{9}{2} = \frac{5}{2} x + \frac{3}{2} x \\ \frac{16}{2} = \frac{8}{2} x \\ \frac{16}{2} \times \frac{2}{8} = x \\ \frac{32}{16} = 2 = x$

$y = \frac{7}{2} - \frac{3}{2} \times 2 \\ y = \frac{7}{2} - 3 \\ y = \frac{1}{2}$