To graph them, you need to put them into the formula y=mx+b. If x+y=8 subtract x to get y=-x+8. 8 is the y-intercept and your line should be heading downward from left to right.
-20
20 = 400
20 plus 20 equals 4020 plus 20 = 40
Yes.
-5
803 + 20 = 823823 - 100 = 723803 plus 20 minus 100 equals 723.
205
20 percent is equivalent to .20 multiply 280 by .20 equals 56 280 plus 56 equals 336
1985 plus 20 is 2005
-15 plus 20 is 5.
Of course!
-20