Solve for b. ab + c = d

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )

X-10/4 when x = –18 a 7 b –2 c –7 d 2