Respuesta :
Answer:
d = 9, e = 3
Step-by-step explanation:
Given the 2 equations
- 5d + 8e = - 21 → (1)
3d - 4e = 15 → (2)
Multiplying (2) by 2 and adding to (1) will eliminate the term in e
6d - 8e = 30 → (3)
Add (1) and (3) term by term to eliminate e, that is
d = 9
Substitute d = 9 into either of the 2 equations and solve for e
Substituting into (2)
3(9) - 4e = 15
27 - 4e = 15 ( subtract 27 from both sides )
- 4e = - 12 ( divide both sides by - 4 )
e = 3
Thus d = 9 and e = 3
Answer:
d = 9
e = 3
Step-by-step explanation:
- 5d + 8e =-21
3d - 4e = 15 | ×2
________________ +
- 5d + 6d + 8e - 8e = - 21 + 30
d = 9
3d - 4e = 15
3×9 - 4e = 15
4e = 27 - 15
4e = 12
e = 3
