Question

If -3x+9y = a and -5x-y = b , then x-y is equal to ?

Answer 1

Your question is

$- 3x + 9y = a \: \: \: \: and \: \: \: \: - 5x - y = b$

Step-by-step explanation:

$here \\ - 3x + 9y = a = > - 3x = a - 9y \\ = > x = \frac{a - 9y}{3}$

$substituting \: value \: of \: x \: in \: eqn \: 2$

$- 5( \frac{a - 9y}{3} ) - y \\ = > - 5a + 45y - y = 3b \\ 44y = 3b + 5a = > y = \frac{3b + 5a}{44}$

$now \: x = \frac{a - 9y}{3} = > \frac{a - 9( \frac{3b + 5a}{44}) }{3}$

$x = \frac{a - \frac{27b - 45a}{396} }{3}$

$x = \frac{\frac{396a}{396} - \frac{27b}{396} - \frac{45a}{396} }{3}$

$x = \frac{ \frac{351a - 27b}{396}}{3}$

$x = \frac{(351a - 27b)(3)}{396}$

$now \: substituting \: the \: value \: you \: can \: find \: x - y$

$kindly \: check \: the \: ans \: also$