Question

The value of y for which the expressions 9y - 8 and 4y + 7 becomes equal is *
2 points​

Answer 1

Answer:

Step-by-step explanation:

9y - 8 = 4y + 7

9y - 4y = +7 +8

5y = 15

y = 3

ANSWERED BY GAUTHMATH

Answer 2

$\maltese\LARGE\textsf{\underline{ EqUaTiOn :-}}$

$\large\textsf{ }$

$\qquad\tt{:}\longrightarrow\boxed{\large\textsf\textcolor{red}{9y - 8 = 4y + 8}}$

$\large\textsf{ }$

$\maltese\LARGE\textsf{\underline{ SoLuTioN :-}}$

$\large\textsf{ }$

$\qquad\tt{:}\longrightarrow\large\textsf{9y - 8 = 4y + 7}$

$\qquad\tt{:}\longrightarrow\large\textsf{9y - 4y = 7 + 8}$

$\qquad\tt{:}\longrightarrow\large\textsf{5y = 15}$

$\qquad\tt{:}\longrightarrow\large\sf \: y \: \: \: = \: \: \: \xcancel \cfrac{15}{5}$

$\qquad\tt{:}\longrightarrow \boxed{\large \sf \color{orange} \: y \: \: \: = \: \: \: 3}$

$\large\textsf{ }$

$\maltese\LARGE\textsf{\underline{ AlGeBrAiC FoRmUlaS :-}}$

$\large\textsf{ }$

$\boxed{\begin{array}{ c }\qquad\tt{:}\longrightarrow\large\textsf{( a + b )² = a² + b² + 2ab}\\\\\\\qquad\tt{:}\longrightarrow\large\textsf{( a - b )² = a² + b² - 2ab}\\\\\\\qquad\tt{:}\longrightarrow\large\textsf{a² - b² = ( a + b ) ( a - b )}\\\\\\\qquad\tt{:}\longrightarrow\large\textsf{a² + b² = ( a + b )² - 2ab}\\\\\\\qquad\tt{:}\longrightarrow\large\textsf{a³ + b³ = ( a + b ) ( a² - 2ab + b² )}\\\\\\\qquad\tt{:}\longrightarrow\large\textsf{a³ - b³ = ( a - b ) ( a² + ab + b² )}\\\\\\\qquad\tt{:}\longrightarrow\large\textsf{( a + b + c )² = a² + b² + c² + 2ab + 2bc + 2ac }\end{array}}$