-5(7+2y)+15(x+2y); x=7 and y=-7

If the slope of one line equals the slope of another line then ? a) the two lines are intersecting lines b) the two lines are perpendicular lines c) the two lines are parallel lines d) the two lines always have very steep slopes

Asquare parking lot has 6,400 square meters what is the length in meters

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?