Question

Alguem poderia me ajudar nesse sistema
-2D+E+F+ -5
-2D+7E+F=-53
8D+7E+F=-113

Answer 1

{-2D+E+F=-5
{-2D+7E+F=-53
{8D+7E+F=-113
[-2. 1. 1]. -2. 1
[-2. 7. 1] -2. 7
[8. 7. 1]. 8. 7
∆=-14+8-14-56+14+2
∆=-60
[-5. 1. 1]. -5. 1
[-53. 7. 1]. -53. 7
[-113. 7. 1]. -113. 7
∆D=-35-113-371
∆D=-519
[-2. -5. 1]. -2. -5
[-2. -53. 1] -2. -53
[8. -113 1]. 8. -113
∆E=106-40+226+424-226-10
∆E=480
[-2. 1 -5]. -2. 1
[-2. 7. -53]. -2. 7
[8. 7. -113]. 8. 7
∆F=1582-424+70+280-742-22-6
∆F=540
∆D/∆=-519/-60=8,65
∆E/∆=480/-60=-8
∆F/∆=540/-60=-9