Slope intercept equation:
y= mx+b
Where:
m= slope
b= y-intercept
We already have
m= 1/2
y= 1/2x+b
Replace x,y by the point given (4,-2), and solve for b
-2 = 1/2 (4)+b
-2 = 2+b
-2-2 = b
-4 =b
Final equation:
y= 1/2x -4
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