Sagot :
[tex]\begin{cases} y=-3x+5 \\ 5x-4y=-3 \end{cases}\\ \\\begin{cases} y=-3x+5 \\ 5x-4(-3x+5)=-3 \end{cases}\\ \\\begin{cases} y=-3x+5 \\ 5x+12x-20=-3 \end{cases}\\ \\\begin{cases} y=-3x+5 \\ 17x =-3+20 \end{cases}[/tex]
[tex]\begin{cases} y=-3x+5 \\ 17x =17 \ \ /:17 \end{cases}\\ \\ \begin{cases} y=-3 \cdot 1+5 \\ x =1 \end{cases}\\ \\ \begin{cases} y=-3 +5 \\ x =1 \end{cases}\\ \\ \begin{cases} y=2 \\ x =1 \end{cases}\\ \\[/tex]
[tex]\begin{cases} y=-3x+5 \\ 17x =17 \ \ /:17 \end{cases}\\ \\ \begin{cases} y=-3 \cdot 1+5 \\ x =1 \end{cases}\\ \\ \begin{cases} y=-3 +5 \\ x =1 \end{cases}\\ \\ \begin{cases} y=2 \\ x =1 \end{cases}\\ \\[/tex]
y = -3x + 5
5x - 4y = -3
5x - 4(-3x + 5)
5x + 12x - 20 = -3
17x = -3 + 20
17x = 17
x = 17 / 17
x = 1
y = -3(1) + 5
y = -3 + 5
y = 2
5x - 4y = -3
5x - 4(-3x + 5)
5x + 12x - 20 = -3
17x = -3 + 20
17x = 17
x = 17 / 17
x = 1
y = -3(1) + 5
y = -3 + 5
y = 2