Объяснение:
[tex]7x + 3y = 48 \\ y = 3x \\ 7x + 3 \times 3x = 48 \\ 7x + 9x = 48 \\ 16x = 48 \\ x = 3 \\ y = 3 \times 3 = 9[/tex]
[tex]3x - 17y = 5 \\ x = 4y \\ 3 \times 4y - 17y = 5 \\ 12y - 17y = 5 \\ - 5y = 5 \\ y = - 1 \\ x = - 4[/tex]
[tex]4x + 3y = 6 \\ x - 2y = 7 \\ x = 7 + 2y \\ 4(7 + 2y) + 3y = 6 \\ 28 + 8y + 3y = 6 \\ 11y = - 22 \\ y = - 2 \\ x = 3[/tex]
[tex]x - y = 2 \\ \frac{x}{y} = \frac{3}{2} \\ x - y = 2 \\ 2x = 3y \\ x - y = 2 \\ 2x - 3y = 0 \\ x = 2 + y \\ 2(2 + y) - 3y = 0 \\ 4 + 2y - 3y = 0 \\ - y = - 4 \\ y = 4 \\ x = 2 + 4 = 6[/tex]
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Answers & Comments
Объяснение:
[tex]7x + 3y = 48 \\ y = 3x \\ 7x + 3 \times 3x = 48 \\ 7x + 9x = 48 \\ 16x = 48 \\ x = 3 \\ y = 3 \times 3 = 9[/tex]
[tex]3x - 17y = 5 \\ x = 4y \\ 3 \times 4y - 17y = 5 \\ 12y - 17y = 5 \\ - 5y = 5 \\ y = - 1 \\ x = - 4[/tex]
[tex]4x + 3y = 6 \\ x - 2y = 7 \\ x = 7 + 2y \\ 4(7 + 2y) + 3y = 6 \\ 28 + 8y + 3y = 6 \\ 11y = - 22 \\ y = - 2 \\ x = 3[/tex]
[tex]x - y = 2 \\ \frac{x}{y} = \frac{3}{2} \\ x - y = 2 \\ 2x = 3y \\ x - y = 2 \\ 2x - 3y = 0 \\ x = 2 + y \\ 2(2 + y) - 3y = 0 \\ 4 + 2y - 3y = 0 \\ - y = - 4 \\ y = 4 \\ x = 2 + 4 = 6[/tex]