Answer:
the correct answer is a. (x = 2, y = 1, z= -2).
you can try inserting each value to all three equations and you'll see that only "a" satisfies all equations.
Step-by-step explanation:
4x+4y+3z=6
4(2)+4(1)+3(-2) = 12-6 = 6
4x + 7y + 5z = 5
4(2)+7(1)+5(-2) = 15-10 = 5
5x + 3y + 3z= 7
5(2)+3(1)+3(-2) = 13-6 = 7
now, you can clearly see that all the equations are satisified with the help of the employment of the three values x=2 , y=1, and z = -2 which makes A the correct answer.
