Question

3x+4y =9, 2x+5y= 7 then find value x+y =?.​

Answer 1

$\huge \orange{ \overbrace{ \red{\underbrace \color{blue} {\underbrace \color{black}{\colorbox{lime}{ {\red \: {☘Answer ☘ }}}}}}}}$

✪QUESTION✪:-

3x+4y =9, 2x+5y= 7 then find value x+y =?.

✪ANSWER✪:-

(1) ➜3x+4y =9

(2)➜2x+5y= 7

by elimination method ,

(1) ×2➜6x + 8y = 18

(2)×3➜6x +15y = 21

__________________

➠ -7y = -3

➠ y=-3/-7

➠$\boxed{\sf{y=3/7}}$

sub/: y=3/7 in (1),

➠3x + 4y =9

➠3x + 4(3/7) = 9

➠3x + 12/7 = 9

➠(21x +12)/7 = 9

➠21x +12 = 9×7

➠21x = 63 - 12

➠21x = 51

➠x = 51/21

➠$\boxed{\sf{x = 17/7}}$

FIND VALUE X+Y =? :

➥x+y = 17/7 + 3/7

➥$\boxed{\sf{x+y = 20/7}}$

Answer 2

(1) ➜3x+4y =9

(2)➜2x+5y= 7

by elimination method ,

(1) ×2➜6x + 8y = 18

(2)×3➜6x +15y = 21

__________________

➠ -7y = -3

➠ y=-3/-7

y=3/7

sub/: y=3/7 in (1),

➠3x + 4y =9

➠3x + 4(3/7) = 9

➠3x + 12/7 = 9

➠(21x +12)/7 = 9

➠21x +12 = 9×7

➠21x = 63 - 12

➠21x = 51

➠x = 51/21

➠{x = 17/7}}

x=17/7

FIND VALUE X+Y =? :

➥x+y = 17/7 + 3/7

➥{x+y = 20/7}}

x+y=20/7