Ответ:

[tex]y=-2\frac{1}{2}x+2\\\\x=-\frac{2}{5}y+\frac{4}{5}[/tex]

Объяснение:

[tex]5x+2y=4\\2y=-5x+4\ \ \ |:2\\y=-\frac{5}{2}x+2\\y=-2\frac{1}{2}x+2\\\\5x+2y=4\\5x=-2y+4\ \ \ |:5\\x=-\frac{2}{5}y+\frac{4}{5}[/tex]

1)

[tex]5x + 2y = 4 \\ 2y = 4 - 5x \: \: \: | \div 2 \\ y = 2 - 2.5x[/tex]

2)

[tex]5x + 2y = 4 \\ 5x = 4 - 2y \: \: \: | \div 5\\ x = 0.8 - 0.4y[/tex]