Question 1110743
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The letters x and y are simply placeholders for numbers. When we say x+4 we mean "some number plus 4". So for example, we can replace x with 0 to go from x+4 to 0+4.


If we do so, then we will have...
y = x+4
y = 0+4
y = 4
So x = 0 pairs up with y = 4. They form the ordered pair (0,4)
The term "point" is a shorter term for "ordered pair"
The first value is the x value; the second coordinate is the y value
All ordered pairs or points are of the form (x,y)


If we replaced x with 6, then we would have y equal to...
y = x+4
y = 6+4
y = 10
So another ordered pair is (6,10)


Now plot the two points (0,4) and (6,10). 
They are marked as point A and point B respectively
<img src = "https://i.imgur.com/zmUnvZy.png">
The point (0,4) is the y intercept as it is on the y axis. We get to this point by moving 4 units up from the origin
The point (6,10) is located by starting at the origin, then moving 6 units to the right and finally 10 units up.


Then draw a straight line through those two points. This line extends infinitely in both directions
<img src = "https://i.imgur.com/4MxN4Ui.png">
Notes:
The slope of y = x+4 is 1 because y = x+4 is the same as y = 1x+4. It is in the form y = mx+b where m is the slope
The y intercept is b = 4 which is where the red graph crosses the vertical y axis.
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