Identify whether each phrase is an expression, equation or inequality.
2 answers:
Answer:
[see below]
Step-by-step explanation:
An equation is a mathematical statement that states that two expressions are equal. Equations have an equal sign.
An inequality is a mathematical statement that states that two expressions are greater than, less than, greater than or equal to, or less than or equal to.
An expression is a combination of mathematical symbols that show the value of something. It does not have any inequality sign nor an equal sign.
is an inequality. It has a less than sign.
3 - 2 is an expression. It does not have any inequality sign nor an equal sign.
is an equation. It includes an equal sign.
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Answer:
Step-by-step explanation:
Let's find the answer.
Because we have 3 equations and 3 variables (x1, x2, x3) a 3x3 matrix (A) can be constructed by using their respectively coefficients.
Equations:
Eq. 1 : x1 + 2x2 + 5x3 = 5
Eq. 2 : x1 + x2 + x3 = 6
E1. 3 : 4x1 + 6x2 + 5x3 = 7
Coefficients for x1 ; x2 ; x3
From eq. 1 : 1 ; 2 ; 5
From eq. 2 : 1 ; 1 ; 1
From eq. 3 : 4 ; 6 ; 5
So matrix A is:
And the vector of vriables (X) is:
Now we can find the resulting vector (B) using the 'resulting values' from each equation:
In conclusion, AX=B is: