Answer:
x = - 7, y = 6
Step-by-step explanation:
7x + 7y = - 7 -----> equation 1
- 10x - 7y = 28 -----> equation 2
Add equations 1 & 2,
7x + 7y = - 7
- 10x - 7y = 28
___________
- 3x + 0 = 21
- 3x = 21
x = 21 / - 3
x = - 7
Substitute x = - 7 in equation 1,
7x + 7y = - 7
7y + 7x = - 7
7y + 7 ( - 7 ) = - 7
7y - 49 = - 7
7y = - 7 + 49
7y = 42
y = 42 / 7
y = 6
Answer:
x = -7
y = 6
Step-by-step explanation:
7x + 7y = -7 ------------------(I)
-10x - 7y = 28 ----------------(II)
Add both the equation and so y will be eliminated and we can find the value of x
(I) 7x + 7y = -7
(II) -10x - 7y = 28 {Now add}
-3x = 21 {Divide both sides by (-3)}
x = 21/-3
x = -7
Plugin x = -7 in equation (I)
7*(-7) + 7y = -7
-49 + 7y = -7
7y = -7 + 49
7y = 42
y = 42/7
y = 6
