3x+y=9 2x+2y=10 Nilai 8x-4y adalah.Kerjakan dengan cara metode subtitusi​

Metode substitusi [tex]3x + y = 9 \\ y = - 3x + 9 \\ \\ Nilai \: x \\ 2x + 2y = 10 \\ 2x + 2( - 3x + 9) = 10 \\ 2x - 6x + 18 = 10 \\ - 4x = 10 - 18 \\ - 4x = - 8 \\ \: \: x = 2 \\ \\ Nilai \: y \\ y = - 3x + 9 \\ y = - 3(2) + 9 \\ y = - 6 + 9 \\ y = 3 \\ \\ 8x - 4y \\ 8(2) - 4(3) \\ 16 - 12 \\ 4[/tex]

Answered by dεωιρω | 2025-08-08

Penyelesaian[tex]3x + y = 9[/tex][tex]2x + 2y = 10[/tex][tex]x + y = 5[/tex][tex]y = 5 - x[/tex][tex]3x + (5 - x) = 9[/tex][tex]2x + 5 = 9[/tex][tex]2x = 4[/tex][tex]x = 2[/tex][tex]y = 5 - 2[/tex][tex]= 3[/tex]

Answered by vinganzbeut | 2025-08-08