Which of the following matrices could be used to solve the system of equations? 3x +2y+z= -5
4x=4
2x + 2y + 2z = 10

Explain how you can use the associative property to evaluate (7x50)x4.

What is the expression in factored form? -20x^2 - 12x a. 4x(5x+3) b. -4x(5x-3) c. -4(5x+3) d. -4x(5x+3)

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11