SJMHeat
SJMHeat
08-09-2017
Mathematics
contestada
How do I solve this?
Respuesta :
kphung76127
kphung76127
08-09-2017
Multiply the first equation by 2
4x-6y=16
Then add the equations to eliminate x
4x-6y=16
-4x+5y=-10
-y=6
y-=6
Plug the y value in
2x-3(-6)=8
2x+18=8
2x=-10
x=-5
Final answer: (-5,-6)
Answer Link
Cyu437
Cyu437
08-09-2017
2x -3y = 8 ---> y = 2/3x +-8/3
-4x +5(2/3x + -8/3) = -10
-4x + 10/3x + -40/3 = -10
-2/3x + -40/3 = -10
plus 40/3 on both side
=
-2/3x = 10/3
multiply both side by 3/-2
=
-5
x = -5 y = -6
y = sub x into orginal equation
Answer Link
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