Need help w 3 and 4 pls
1 answer:
Since you are solving for x, your objective is to get x by itself
3a).
first subtract b on both sides
then divide by a
3b).
first multiply by b on both sides
then divide by a
subtract by 2
4).
Since a is negative, when dividing the sign of the inequality would change such that > would be < and vice versa. The same applies to greater than or equal to and less than or equal to.
ax+b>d
first subtract b
ax>d-b
then divide by a to get x bu itself, but since a is negative the > sign would change to <
So the answer choice 2 is the solution for question 4
3a).
first subtract b on both sides
then divide by a
3b).
first multiply by b on both sides
then divide by a
subtract by 2
4).
Since a is negative, when dividing the sign of the inequality would change such that > would be < and vice versa. The same applies to greater than or equal to and less than or equal to.
ax+b>d
first subtract b
ax>d-b
then divide by a to get x bu itself, but since a is negative the > sign would change to <
So the answer choice 2 is the solution for question 4
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Question 1:
For this case we have the following system of equations:
2x - y = 5
x + 3y = 7
We rewrite the system of equations of the form:
Ax = b
Where,
A: coefficient matrix.
x: incognita vector
b: vector solution.
We have then:
![A = \left[\begin{array}{ccc}2&-1\\1&3\\\end{array}\right] b = \left[\begin{array}{ccc}5\\7\\\end{array}\right] x = \left[\begin{array}{ccc}x\\y\\\end{array}\right]](https://tex.z-dn.net/?f=A%20%3D%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D2%26-1%5C%5C1%263%5C%5C%5Cend%7Barray%7D%5Cright%5D%20%0A%0Ab%20%3D%20%20%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D5%5C%5C7%5C%5C%5Cend%7Barray%7D%5Cright%5D%20%0A%0Ax%20%3D%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Dx%5C%5Cy%5C%5C%5Cend%7Barray%7D%5Cright%5D%20)
We look for the determinant of A.
We have then:
Amswer:
the value of the system determinant is:
A = 7
Question 2:
For this case, the first thing we must do is define variables:
x, y: unknown numbers.
We then have the following system of equations:
One number is 7 more than twice another:
their difference is 22:
Solving the system of equations we have:
Therefore, the largest number is:
Answer:
the larger number is 37
For this case we have the following system of equations:
2x - y = 5
x + 3y = 7
We rewrite the system of equations of the form:
Ax = b
Where,
A: coefficient matrix.
x: incognita vector
b: vector solution.
We have then:
We look for the determinant of A.
We have then:
Amswer:
the value of the system determinant is:
A = 7
Question 2:
For this case, the first thing we must do is define variables:
x, y: unknown numbers.
We then have the following system of equations:
One number is 7 more than twice another:
their difference is 22:
Solving the system of equations we have:
Therefore, the largest number is:
Answer:
the larger number is 37