Answer:
Step-by-step explanation:
xy = 42
x+y = - 2 Substitute into the top equation
y = -2 - x Put in for y
x(-2 - x) = 42 Remove the brackets
-2x - x^2 = 42 Subtract 42 from both sides.
-2x - x^2 - 42 = 0 Put in the more normal order.
-x^2 - 2x - 42 = 0 Multiply by -1
x^2 + 2x + 42 = 0
This cannot be factored. It gives complex roots as it is written. I will give you the answer but I kind of doubt the question is correct.
x1 = - 1 + 6.40i
x2 = -1 - 6.40i
Leave a comment if you have a correction.
1600 / 120 = 13.3
You will need 14 boxes.
120 x 0.3 = 36
There were 36 kernels in the partially filled box.
Answer:
value of x is 7
Step-by-step explanation:
from question
k+b=90
5x+15+40=90
5x=90-55
5x=35
hence, x=7
