Hello!
You can substitute y into the other equation
7 = -3x - 2
Add 2 to both sides
9 = -3x
Divide both sides by -3
-3 = x
The answer is -3
Hope this helps!
Answer: the cost of a tent is $45
the cost of a sleeping bag is $35
the cost of a camp stool is $5
Step-by-step explanation:
Let x represent the cost of a tent.
Let y represent the cost of a sleeping bag.
Let z represent the cost of a camp stool.
A customer buys a tent, 3 sleeping bags, and 4 camp stools for $170. It means that
x + 3y + 4z = 170- - - - - - - - - - - - - - -1
The price of the tent is 9 times the cost of a camp stool. It means that
x = 9z
The cost of a sleeping bag is $30 more than the cost of a camp stool. It means that
y = z + 30
Substituting x = 9z and y = z + 30 into equation 1, it becomes
9z + 3(z + 30) + 4z = 170
9z + 3z + 90 + 4z = 170
9z + 3z + 4z = 170 - 90
16z = 80
z = 80/16
z = 5
y = z + 30 = 5 + 30
y = 35
x = 9z = 9 × 5
x = 45
Answer:
Expression for perimeter of rectangle is:
Step-by-step explanation:
Width of rectangle is given as 
centimeters and
length of the rectangle is given as 
centimeters.
To find:
The expression to represent the perimeter of rectangle in centimeters.
Solution:
First of all, let us have a look at the formula to calculate the perimeter of a rectangle.
Perimeter of a polygon is equal to sum of all the sides.
In rectangle, we have a total of 4 sides, 2 sides equal to the width and 2 sides are equal to the length of rectangle.
Therefore, perimeter of a rectangle is equal to twice the sum of width and length of the rectangle.
So, formula:
Where 
is the length of rectangle and
is the width of rectangle.
Putting the values of length and width as given in the question statement to find its perimeter:
The answer is A i believe
