Question

find the value of x and y x+y=7 ; x-y= -1​

Answer 1

Answer:

x = 3 y = 4

Step-by-step explanation:

x + y = 7

now, y = 7- x

now, we have to substitute,

x - (7 -x ) = -1

x -7 + x = -1

2x = 6

x = 3

y = 7 - 3

y = 4

Answer 2

Step-by-step explanation:

$\huge \underline{ \rm{† Question †}}$

Find the value of x and y x+y=7 ; x-y= -1

$\huge \underline{ \rm{†Answer†}}$

Concept :

• Elimination method
• Substitution method

To Find :

Find x and y

Solution:

Elimination method:

$\tt \: x \: \: \: + y \: \: \: = \: \: \: \: 7$

$\tt \: x \: \: \: - y \: \: \: = \: \: \: - 1$

$\underline{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }$

$\tt \: 2x \: \: \: \: \: \: \: \: \: \: \: = - 6$

x = 6/2

x = 3

substitute in x in any equation

x - y = -1

3 -y = -1

-y = -1-3

-y = -4

y =4