Okay. I will, rosala.
Solution: 3x+y=-4 = 3*1+-7
= 3+-7
= -4
Solution (Same as above but in words): First, you write out the math problem. Then, you subsitute x and y. BUT you HAVE to subsitute x first. So, if x=1, multiply 3 by 1. After that, because you have 3 and y, so to make -4, turn y into -7. Finally, you add positive 3 and negative 7 which makes -4. That is your answer.
