Answer:
For first equation, x could equal 10 and y could equal 5. For second equation, x could equal 2 and y could equal 1/2.
Explanation:
First equation-
When you first look at the equation, you may see it as numbers, but its not. From what you see, 3x -3y = 15. To equal positive fifteen, x should be two times more than y, so that 3x would be greater than 37, and therefore the answer would be positive. Since the answer is fifteen, you should probably substitute y with 5. This leaves you with 3x - 15 = 15. To equal 15, x should be two times more than y (5), so you would substitute x with 10, since 10 is two times greater than 5. Now, the substitute the values with 10 and 5. The equation should be correct.
Equation two-
What you see here is -3x + 6y = -3. To make this simpler, you could divide both sides by 3, which leaves you with -x + 2y = -1. Y clearly has to be a value less than x so that the answer is -1. For this work, I substituted y with 1/2, since 1/2*2 = 1, which you would add to x. And for the answer to be -1, x has to be 2. Also, there is a negative sign before the x so that's why I used a positive number. (Negative makes positive negative :P)
I hope this helped :D
