Use the equation; y=mx+b where m is the slope
Use your 2 points as y and b (intercept)
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y = {slope}x + {y intercept}
-7
Write the equation of a line in slope-intercept form that has a slope of -2 and passes through the point (2, -8).
Here is how to solve it. First, find the slope of the given line. To do this, solve the equation for "y". That will convert the equation to the slope-intercept form. From there, you can immediately read off the slope. Since parallel lines have the same slope, the line you are looking for will have the same slope. Now you need to use the point-slope form of the equation, with the given point, and the slope you just calculated. Finally, solve this equation for "y" to bring it into the requested slope-intercept form.
If you mean y = 3x then the slope is 3 and there is no y intercept