The length of a rectangle is 7 cm , and the width is 4cm , If both the length and the width are increased by equal amounts , the area of the rectangle is increased by 42cm ^ 2 . How do I find the length and width of the larger rectangle ?
How can I show that the points -LSB- math -RSB- P -LRB- 2,-3 -RRB- , Q -LRB- 3,1 -RRB- -LSB- / math -RSB- and -LSB- math -RSB- R -LRB- 5,9 -RRB- -LSB- / math -RSB- are collinear ?