Answer:
Explanation:
y = x² + 7x - 5 ............ (1)
2x - y = - 9 ................ (2)
(1) ------> (2)
2x - ( x² + 7x - 5 ) = - 9
- x² - 5x + 14 = 0 ........ (3)
- 1 × (3)
x² + 5x - 14 = 0
( x + 7 )( x - 2 ) = 0
= - 7 and
= 2
2( - 7) -
= - 9 ⇒
= - 5
2(2) -
= - 9 ⇒
= 13
The solutions of system are
( - 7, - 5 ) and ( 2, 13 )