write the slope-intercept form of the equation of each line x-y=-7
you want y all by itself on the left: y = mx+b
So, start moving stuff around.
x-y = -7
x = -7+y
x+7 = y
or
y = x+7
So, start moving stuff around.
x-y = -7
x = -7+y
x+7 = y
or
y = x+7