Answer:
(3x+8)
Step-by-step explanation:
It is the difference of 2 squares

The slope formula is (Y2-Y1)/(X2-X1). Plug in your points and you'll find that the slope = 4/11.
Answer: a= 1 b=-8 c=15
Step-by-step explanation:
A is the number before 
B is the number (including the sign) before X
c is the number without a variable
Let's call the younger student's age A and the older student's age B. The teacher's age will be T.
B = 2A
T = 5B
T+5 = 5(A+5)
Simplify the last equation.
T+5 = 5A+25
T = 5A+20
Now we have two equations solved for T, so we can set them equal to each other.
5B = 5A + 20
We can plug 2A in for B
5(2A) = 5A + 20
10A = 5A + 20
5A = 20
A = 4
To find T, we plug 4 in for A in T = 5A + 20
T = 5(4) + 20
T = 40
The answer is 40 years old.