Question 1169964
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Slope-intercept form: y = mx+b<br>
The slope of the given line is -2, so the slope of a line perpendicular to that line is +1/2.  So the equation you are looking for is<br>
y = (1/2)x+b<br>
To determine b and thus complete the equation, use the given point (4,2) to substitute 4 for x and 2 for y, then solve for b.<br>