Answer:
9x - 8
Step-by-step explanation:
the perimeter is the sum of the sides, hence
perimeter = 5x - 2 + 3x + 4 + x - 10 ( collect like terms )
= 9x - 8 ← polynomial of degree 1
I believe the answer is D
Answer:
The solution is (-5, -2).
Step-by-step explanation:
We'll use "elimination by addition and subtraction."
Multiply the second row by -2. Our system
– 7x – 10y = 45
-3x - 5y = 25
becomes:
– 7x – 10y = 45
+6x + 10 y = -50
-------------------------
-x = 5, so that x = -5.
Substituting -5 for x in the second equation results in
-3(-5) - 5y = 25, or 15 - 5y = 25. This reduces to
-5y = 10, so that y must be -2.
The solution is (-5, -2).
We can check this two ways: distributing the -0.5, and plugging in a number for x.
First, we can check this by distributing the -0.5. Our equation becomes:
-1.5x -2.5 = -1.5x + 2.5
Clearly, this is not true. We can show this one more time by plugging in a number for x. I will use 2.

Now, we evaluate both sides and see if they are equal.
-3 - 2.5 = -3 + 2.5
-5.5 = 0.5
Clearly, this is not true. These expressions are not equivalent.
Answer:
7/9y+441/567
Step-by-step explanation:
y^2-49/81y+567÷y-7/63
=y^2-49/81y+567×63/y-7
=(y-7)(y+7)/81y+567×63/y-7
=(y+7)×63/81y+567
=63y+441/81y+567
=7/9y+441/567