Question

Which ordered pair is a solution to the system?

{x+4y=19
{y=-2x-4

a) (-5, 6)
b) (-2, 0)
c) (3, 4)
d) (7,3)

Answer 1

The solution is A. (-5,6)

Answer 2

x + 4 y = 19
y = - 2 x - 4
------------------
x + 4 * ( - 2 x - 4 ) = 19
x - 8 x - 16 = 19
- 7 x = 29 + 16
- 7 x = 35
x = 35 : ( - 7 )
x = - 5
y = 10 - 4
y = 6
Answer:
A ) ( - 5 , 6 )