Question 1199205
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A visual approach:


Plot the point (5,3) on the xy grid.


The slope 1/2 tells us to "go up 1, then to the right 2 units".
This is because:
slope = rise/run = 1/2
rise = 1 = go up 1
run = 2 = go to the right 2


If we started at (5,3) and did the "up 1, right 2" movement pattern, then we'll arrive at (7,4). See the graph below.


But we want the y coordinate to be 2 instead of 4. I'm referencing the point (R,2).


Let's reverse the "up 1, right 2" process.
Instead we'll follow "down 1, left 2".


Again we start at the anchor (5,3).
Move down 1, left 2 to arrive at (<font color=red>3</font>, 2) which shows that <font color=red>R = 3</font>


Graph:
{{{drawing(400,400,-4,10,-4,10,
graph(400,400,-4,10,-4,10,-100,0.5x+0.5),
circle(3,2,0.08),
circle(3,2,0.1),
circle(3,2,0.12),
locate(3,2,"(3,2)"),

circle(5,3,0.08),
circle(5,3,0.1),
circle(5,3,0.12),
locate(5,3,"(5,3)"),

circle(7,4,0.08),
circle(7,4,0.1),
circle(7,4,0.12),
locate(7,4,"(7,4)")

)}}}
The green line represents the linear equation y = 0.5x+0.5
1/2 = 0.5
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