The matrix method is being used to solve the system of equations x + 2y = 4 and 3x - y = 6.

if the goal of the first matrix operation is to get a zero in row 2, column 1, then one could
a) subtract 3 from each entry of row 2
b) multiply row 1 by -3 and add the result to row 2
c)divide row 2 by -3 and add to row 1

b) multiply row 1 by -3 and add the result to row 2

Step-by-step explanation:

the correct answer is 5

option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.