if (x,y) is a solution to the system of equations above, what is the value of x-y?
A)-20
B)-8
C)-4
D)8
can you show your work please
Answer:
Step-by-step explanation:
The given system of equations :
Multiply equation (1) with 3 and equation (2) with 2 , we get
Now subtract equation (4) from equation (3), we get
Substitute the value of y in equation (1), we get
Hence, the solution of the system : (x,y)=(2,6)
Now, consider and substitute the value of x and y , we get
The solution to the equation is x - y = -4
Given data ,
To solve the system of equations, we can use the method of substitution or elimination. Let's use the method of elimination:
Multiply the first equation by 3 and the second equation by 2 to make the coefficients of x in both equations equal:
(3)(2x-3y) = (3)(-14)
(2)(3x-2y) = (2)(-6)
Simplifying these equations gives:
6x-9y = -42
6x-4y = -12
Now, subtract the second equation from the first equation:
(6x-9y) - (6x-4y) = (-42) - (-12)
-5y = -30
Divide both sides by -5:
y = 6
Substitute this value of y back into one of the original equations, let's use the first equation:
2x - 3(6) = -14
2x - 18 = -14
2x = 4
x = 2
Now , the value of x - y is given by
A = x - y
A = 2 - 6
A = -4
Hence , the equation is solved
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The value of g(-4) is 1. The correct option is C
A function that has a different sub-function for different intervals of the domain is called Piece-Wise Function
The functions for the different interval is
g(x)= , x ≤ -4
= -x² +11 , x > -4
The value of g(-4) will be determined by using g(x)=
Substituting the value x = -4
g(x) =
g(x) = ∛1
g(x) = 1
Therefore, The value of g(-4) is 1. The correct option is C
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3.what is the speed of a car in feet/second that is traveling 60 miles/hour?
Answer:
x = - 7, x = - 1
Step-by-step explanation:
Given
x² + 8x + 7 = 0
Consider the factors of the constant term (+ 7) which sum to give the coefficient of the x- term (+ 8)
The factors are + 7 and + 1 , since
7 × 1 = 7 and 7 + 1 = 8 , then
(x + 7)(x + 1) = 0 ← in factored form
Equate each factor to zero and solve for x
x + 7 = 0 ⇒ x = - 7
x + 1 = 0 ⇒ x = - 1
Answer:
Step-by-step explanation:
where a 0 so a = 1 b = 8 c = 7
Quadratic Formula:
Evaluate the exponent and multiply 4ac
Subtract b^2 - 4ac and multiply 2a
Solve for the sqrt root of 35
x = - 8 ± 6/2 =
x = - 8 + 6/2 = -1
x = - 8 - 6/2 = -7
multiple
factor
B. P(A | B) = P(A)
C. P(A ∩ B) = P(A)
D. P(B) = P(A | B)
Answer with Step-by-step explanation:
A and B are independent events.
Then, we have to find,which equation below must be true.
A. P(A) = P(B)
No, this is not true, example
A: Occurence of 1 in rolling a die P(A)=1/6
B: occurence of an even number on rolling a die P(B)=1/2
B. P(A | B) = P(A)
This is true
since, P(A|B)+P(A)/P(A∩B) and, P(A∩B)=P(A)P(B)
C. P(A ∩ B) = P(A)
This is not true
since, P(A∩B)=P(A)×P(B)
D. P(B) = P(A | B)
This is not true