could someone please give me a step by step explanation for this? this problem is new to me and i dont know which steps to take. it would be much appreciated!! <3

Solve: 3x+y=6 4x-2y=18 show all work !

What are the solutions of the equation? 16x^2 + 24x + 5 = 5 a. 1/4, 5/4 b. -1/4, -5/4 c. -1/4, 5/4 d. 1/4 , -5/4

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.