Answer:
800
Step-by-step explanation:
8×10 is 80
80 to the power of 2 is
800
1) 2x + 8y = 20
y=2
Answer:
2x+8y=20;y=2
Solution :
{x,y} = {2,2}
System of Linear Equations entered :
[1] 2x + 8y = 20
[2] y = 2
Graphic Representation of the Equations :
8y + 2x = 20 y = 2
Solve by Substitution :
// Solve equation [2] for the variable y
[2] y = 2
// Plug this in for variable y in equation [1]
[1] 2x + 8•(2) = 20
[1] 2x = 4
// Solve equation [1] for the variable x
[1] 2x = 4
[1] x = 2
// By now we know this much :
x = 2
y = 2
We are done
Solution :
{x,y} = {2,2}
Step-by-step explanation:
Answer:
Step-by-step explanation:
Let's say the magazine costs . Since the pizza costs twice as much as the magazine, the pizza costs .
Now we know that the total cost of the magazine and pizza is $9.75. So, the equation becomes:
Combining like terms, we get:
To solve for , we divide both sides of the equation by 3:
Therefore, the pizza costs:
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Answer:
pizza costs = $3.25
Step-by-step explanation:
let the cost of pizza = $x
let the cost of magazine = $y
according to the question:
x + y = 9.75 (1)
y = 2x (2)
by substituting the value of y from equation (2) into equation (1)
x + 2x = 9.75
3x = 9.75
x = 9.75/3 = 3.25
thus, cost of pizza = $3.25