Question 2612
Equation of the line is y = mx + c
where m is the slope and c is the y intercept
so if slope is 3 and y intercept is also 3 equation of the line will be
y = 3x + 3

If a line is perpendicular to a line with slope m, then the slope of that line will be -1/m
So if the slope of a line be -1 then slope of the line perpendicualr will be 1
y intercept is -1
so equation of the line will be
y = 1x -1
=> y = x-1