3x+3y=0
A.(1,-1) B.(2,4) C.(-1,1) D.(-2,2)
A.(1,-1) B.(2,4) C.(-1,1) D.(-2,2)
For each pair, plug the first number in for x, and the second number in for y, and evaluate. If you get 0=0, then it is a solution.
For example, trying choice A:
3(1) + 3 (-1) = 0
3 - 3 = 0
0 = 0, so choice A is one solution.
Following that example, try B, C, and D to see if any other pairs are solutions. (Hint: at least one more is)