With this information we know that in slope-intercept form that the equation will at least look like this.
y= -2x + b.
But we have to look for b. In order to do this we are going to have to plug in (5,3) into the x and y values.
3= -2(5) + b
3= (-10) + b
13= b
We then put this b value into the slope intercept formula.
y= -2x + 13 < this is your final answer
