Xy=-2
x+y=6
minnus x from second equation
y=6-x
sub for y
x(6-x)=-2
6x-x^2=-2
add x^2 both sides and minus 6x both sides
0=x^2-6x-2
use quadatic formula
if you have
ax^2+bx+c=0
x=

x^2-6x-2=0
a=1
b=-6
c=-2
x=

x=

x=

x=

x=

x=

or x=

aprox
x=6.31662 or -0.316625
those are the numbers
6.31662 and -0.316625
Answer:
There are 12 edges in a rectangular prism.
15 square meters, hmm...
Your answer is 47.1111
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2(x+1)
2x+2 is your final answer
By solving given equations, the value of c is 30.
Given two equations
x + 2y = 10 and
3x + 6y = c
These lines represents the same line for some constant c.
Value of c:
x + 2y = 10-------------(1)
3x + 6y = c-------------(2)
Dividing equation (2) by 3

After solving the above equation, we get
x + 2y = c/3-----------(3)
Remember that a line is written as ax + by = c, in our case, both lines have a =1 and b = 2. Therefore, in orther that the two lines are equal, we need that, 10 = c/3
c = 10 × 3 = 30
c = 30
Therefore,
The value of c is 30.
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