Answer: It is D
Step-by-step explanation:
Evaluate the expression: (x+y)2 when x=2 and y=-5
1 answer:
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I can only use math to explain it. What is 100%?
100% =
percent means per 100.
so 120% = 120/100 = 1.2
120% of a whole number. For example 120% * 10 =
= 12
is it greater than 10.
100% =
percent means per 100.
so 120% = 120/100 = 1.2
120% of a whole number. For example 120% * 10 =
is it greater than 10.
Answer:
The values of x and y to the given equation are x=3 and y=-1
The solution to the given equation is (3,-1)
Step-by-step explanation:
Given equations are
To solve given equations by using elimination method :
Mutliply the equation (2) into 2 we get
Now adding the equations (1) and (3)
_______________
Therefore y=-1
Now substitute the value of y=-1 in the equation (1) we get
-2x+3(-1)=-9
-2x-3=-9
-2x=-9+3
Therefore x=3
The values of x and y to the given equation are x=3 and y=-1
The solution to the given equation is (3,-1)
Answer:
The equation relates the variables is y = 8x ⇒ D
Step-by-step explanation:
If x and y vary directly (y ∝ x), then y = k x, where
- k is the constant of variation
- k can be found using the initial value of x and y
∵ The variable x and y vary directly
∴ y ∝ x
→ By using the rule above
∴ y = k x
∵ y = 40 when x = 5
∴ The initial values of x and y are x = 5 and y = 40
→ Substitute them in the equation above to find k
∵ 40 = k(5)
∴ 40 = 5k
→ Divide both sides by 5
∵ =
∴ 8 = k
→ Substitute the value of k in the equation above
∴ y = 8x
∴ The equation relates the variables is y = 8x