Question

For a simultaneous equations in x and y, Dy = 99, Dx = 63 and D = 3, then find the value of 2x+7y*​

Answer 1

$\huge\pink{\boxed{\red{Ans}{\color{yellow}{wer}}}}$

Given :

$\rightarrow{D\:=\:3}$

$\rightarrow{Dx\:=\:63\:\:,\:\:Dy\:=\:99}$

Explanation :

$\rightarrow{x\:=\:\frac{Dx}{D}}$

$\rightarrow{x\:=\:\frac{63}{3}}$

$\rightarrow{x\:=\:{\cancel{\frac{63}{3}}}}$

$\rightarrow\pink{\boxed{x\:=\:21}}$

$\rightarrow{y\:=\:\frac{Dy}{D}}$

$\rightarrow{y\:=\:\frac{99}{3}}$

$\rightarrow{y\:=\:{\cancel{\frac{99}{3}}}}$

$\rightarrow{\color{cyan}{\boxed{y\:=\:33}}}$

so now we have to find the value of

$\rightarrow{2x\:+\:7y}$

$\rightarrow{2(21)\:+\:7(33)}$

$\rightarrow{42\:+\:231}$

$\rightarrow{\color{blue}{\boxed{273}}}$