Answer:
I don't know ask to your teacher
Answer:

Step-by-step explanation:
Using quadratic formula

we will have two solutions.
2x^2 - x - 4 = 0
So, a=2 b=-1 c=-4, we have:

Finally, we have two solutions:

The 2 numbers are 264 and 266. 264+266=530.
Answer:
Explanation:
12x = 48 - 8y
10x + 8y = 38
———————
12x + 8y = 48
10x + 8y = 38
———————
12x + 8y = 48
-1(10x + 8y = 38)
————————
12x + 8y = 48
-10x - 8y = -38
————————
2x = 10
x = 10/2 = 5
If x = 5 then:
10x + 8y = 38
10(5) + 8y = 38
50 + 8y = 38
8y = 38 - 50
8y = -12
y = -12/8
y = -3/2
Therefore, x = 5 and y = -3/2