x -y =-40 , -7x+3y =180 find the value of x and y by any method.
Answers
Answered by
4
Given -
x - y = -40
-7x + 3y = 180
To Find -
Value of x and y
By Elimination method :-
Now,
[x - y = -40] × 3
[-7x + 3y = 180] × 1
» 3x - 3y = -120
-7x + 3y = 180
______________
-4x = 60 (By Adding)
» x = 60/-4
- » x = -15
Substituting the value of x = -15 on 3x - 3y = -120
Now,
» 3(-15) - 3y = -120
» -45 - 3y = -120
» -3y = -120 + 45
» -3y = -75
» y = -75/-3
- » y = 25
Hence,
The value of x is -15 and y is 25
Verification -
- x - y = -40
» -15 - 25 = -40
» -40 = -40
LHS = RHS
And
- -7x + 3y = 180
» -7(-15) + 3(25) = 180
» 105 + 75 = 180
» 180 = 180
LHS = RHS
Hence,
Verified..
Answered by
2
Answer:
x=-15
y=25
Step-by-step explanation:
x-y=-40[equation 1]
-7x+3y=180[equation 2]
equation 1 *3
=3x-3y=-120
-4x=60
x=-15
3(-15)-3y=-120
-45-3y=-120
120-45=3y
3y=75
y=25
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