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How to solve this system of equations? Please help?
1/2x + 1/4y= -7
-2/3x + 1/2y=11 please show steps thanks
3 Answers
- BeaLv 59 years ago
1/2x + 1/4y= -7
-2/3x + 1/2y=11 ---> multiply by (-1/2)
1/2x + 1/4y= -7
2/6x - 1/4y= -11/2 ---> now you can eliminate y
-------------------------
5/6x = -25/2
x = -25/2(6/5) = (-150/10)
x = -15
substitute this value of x into one of the original equations
-2/3x + 1/2y = 11
-2/3(-15) + 1/2y = 11
30/3 + 1/2y = 11
10 + 1/2y = 11
1/2y = 1
y = 1(2/1) = 2
(-15, 2) <--- solution
- ComoLv 79 years ago
Presentation is incorrect and should be shown as :-
(1/2)x + (1/4)y = - 7
(-2/3)x + (1/2)y = 11
4x + 2y = -56
-4x + 3y = 66_______ADD
5y = 10
y = 2
4x + 4 = - 56
4x = - 60
x = - 15
x = - 15 , y = 2
