(a). 8x + y = 20, where (b). y = x2 - 2x + 4 So where y is in equation (a), substitute in the value of y in (b). 8x + (x2 - 2x + 4) = 20 8x + (4) = 20 Get rid of the 4 on both sides (since what you do to one side, you must do to the other) 8x + 4 - 4 = 20 - 4 8x = 16 Get rid of the 8 to leave x on its own 8x ÷ 8 = 16 ÷ 8 x = 2 So now that you have x, find y but substituting in the value you just found (2) into one of the starting equations. 8x + y = 20 where x is 2. 8(2) + y = 20 16 + y = 20 Minus 16 from both sides y = 20 - 16 = 4 So x is 2 and y is 4
752 second graders went to see Hansel and Gretel on Friday. 25% of the students went to the bathroom during the movie. How many kids went to the bathroom?
Slope is defined simply as delta y over delta x or the change in y over the change of x. We need to decided what points is going to be the start or the end. Typically, the point farther to the right of the graph is considered the end point.