Solve the following system by substitution, if possible. If (x, y) is the solution, find the value of 
.
?
?
?
A. 13
B. 20
C. 12
D. 14
E. no solutions
Answer: D
Mathematics
You might also like to view...
Solve the problem.Gary can hike on level ground 3 miles an hour faster than he can on uphill terrain. Yesterday, he hiked 38 miles, spending 2 hours on level ground and 5 hours on uphill terrain. Find his average speed on level ground.
A. 7
mph
B. 4
mph
C. 8 mph
D. 5
mph
Mathematics
Solve the problem.Find the work done by a force of 17i (newtons) in moving an object along a line from the origin to the point 
(distance in meters).
A. 36.06 J
B. 17
J
C. 51
J
D. 51 J
Mathematics
Factor completely.12x5 + 12x
A. 12(x6 + 1) B. 12x(x4) C. 12(x5 + x) D. 12x(x4 + 1)
Mathematics
Solve the formula for the specified variable.S = 2?rh + 2?r2 for h
A. h = 2?(S - r)
B. h = 
C. h = 
- 1
D. h = S - r
Mathematics