Which method is not used to find the solution of a system of linear equations. guess and check

graphing

substitution

matrices

The answer is guess and check which is A.

Answer is guess and check

Step-by-step explanation:

Linear equations are equations which have degree 1 for variable.

When it is a system of equations, there will be more than one variable.

There are different methods of solving linear system of equations.  If no of variables are equal to no of equations given, normally we can solve that system by using any one of the following methods:

i) Graphing

ii) Substitution

iii) Elimination

iv) Cramer's rule

v) Matrices ,

vi) Cross multiplication , etc

But guess and check is not used to mathematically solve as this will be cumbersome process especially when two or more variables are there

Hence option A is right answer.

24

step-by-step explanation:

the graph shows 30% of students walk. 80 students were questioned, so the number that said they walk is

30% × 80 = 0.30 × 80 = 24

yes

step-by-step explanation:

they have to be opposite and reciprocal of eachother.