which statements about the system are true? check all that apply. y = x – 4 3y – x = –7 the system has one solution. the system
consists of parallel lines. both lines have the same slope. both lines have the same y–intercept. the equations represent the same line. the lines intersect.
The slope of the first equation has a slope of one and a y intercept of -4. The second equation has a y intercept of -2.3333 as seen when plugging in 0 for x, so the same y-intercept and same line are out of the question. This means either they have the same slope and thus are parallel or intersect at some point. A simple way to find out? Plug in 1 for x on the second. If it isn't -1.33333, which is a slope of positive 1 such as in the first equation, they WILL INTERSECT somewhere. When plugging in 1, we get 3y - 1 = -7 3y = -6 y = -2 (1, -2) is the next point after (0, -2.3333) That means it is most certainly not the same slope, and thus they will intersect at some point. The two slopes are 1/1 and 1/3 if you weren't aware.
(this is given in the first sentence)
and 
due to ...
and 
are parallel)
, which means 
, which in turn means 
is a parallelogram.