You and your friend play a video game. You have a final score of 40 points, and your friend has a final score of -21 points. By how many points did you win?

You would have won by 61 points.

Step-by-step explanation:

Since you have 40 and your friend has -21 the equation would be:

40 - (-21) = ?

Since its two negatives you change it to a positive and so it reads

40 + 21 = 61

the difference between the 40 and -21 is 61

x+y=90

x=30-y=x

step-by-step explanation:

if you understand you will get the answer

5

step-by-step explanation: