Question

59 пожалуйста очень надо прошу

Answer 1

$1)\ \ 7-3x=6x-56\ \ \ \to \ \ \ 7+56=9x\ \ ,\ \ 9x=63\ \ ,\ \ x=7\\\\x-3b=-35\ \ \to \ \ \ 7-3b=-35\ \ ,\ \ \ 3b=42\ \ ,\ \ \ \boxed {\ b=14\ }\\\\\\2)\ \ 3,6+5y=7\, (1,2-y)\ \ \to \ \ \ 3,6+5y=8,4-7y\ \ ,\\\\7y+5y=8,4-3,6\ \ \ ,\ \ \ 12y=4,8\ \ ,\ \ y=\dfrac{4,8}{12}=\dfrac{48}{120}=\dfrac{6}{15}\\\\2y-9b=7\ \ \to \ \ \ 2\cdot \dfrac{6}{15}-9b=7\ \ ,\ \ \ 9b=\dfrac{12}{15}-7\ \ ,\ \ 9b=-\dfrac{93}{15}=-\dfrac{31}{5}\ ,\\\\b=-\dfrac{31}{5}:9\ \ ,\ \ \ \boxed {\ b=-\dfrac{31}{45}\ }$