Question

напишите пожалуйста дам 10 баллов (1,3,5) плиз

Answer 1

Задание 1

$\bf\displaystyle -6x+1=5x+9\\\\1 - 9 = 5x+6x\\\\-8=11x\\\\x =-\frac{8}{11}\implies y=-6\cdot(-\frac{8}{11})+1=\frac{48}{11}+1=\frac{48 + 11}{11}=\frac{59}{11}\\\\(x;y) = (-\frac{8}{11};\frac{59}{11})$

Задание 3

$\bf\displaystyle 21-9x = -2.5x + 8\\\\21 - 8 = -2.5x + 9x\\\\13=6.5x\\\\x=\frac{13}{6.5}=2 \implies y=21-9\cdot 2=21-18=3\\\\(x;y)=(2;3)$

Задание 5

$\bf\displaystyle 1-3x=-x-1\\\\1 + 1 = -x + 3x\\\\2 =2x\\\\x = 1 \implies y = -(1) - 1=-2\\\\(x;y)=(1;-2)$