Given the system of equations, what is the x-coordinate of the solution? (matrix)
y = 3 -1/2 x
3x + 4y = 1

22
-17/2
-11

Step-by-step explanation:

The given system of equations solved by matrix method is to arrange all coefficients into a matrix, and then making zeros in specific columns and rows, until we get an equation with just one variable.

In matrix arrangement:

Multiplying by 4 the first row and then subtracting with the second row, we have:

From the firs row, we find that:

Therefore, the right answer is -11.

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.