Solve by the substitution method. x + y = 89x + 9y = 72
A. {(7, 1)}
B. {(0, 0)}
C. {(x, y)| x + y = 8}
D. ?
Answer: C
Mathematics
You might also like to view...
Solve the problem.An aircraft going from Atlanta to Savannah on a heading of 103° (from north) is travelling at a speed of 630 miles per hour. The wind is out of the north at a speed of 25 miles per hour. Find the actual speed and direction of the aircraft.
A. 636 miles per hour; 105° from north B. 628 miles per hour; 105° from north C. 625 miles per hour; 105° from north D. 887 miles per hour; 105° from north
Mathematics
Write as a percent.0.9
A. 0.9% B. 900% C. 0.09% D. 90%
Mathematics
Find the product.(x + 11)(x - 11)
A. x2 - 22x - 121 B. x2 + 22x - 121 C. x2 - 22 D. x2 - 121
Mathematics
Simplify.i17
A. i B. -i C. -1 D. 1
Mathematics