If two angles are both vertical and supplementary, can we determine the angles?

What is the value of x in the equation7x+2y=48 when y=3

Mila's dog weighs 4 pounds more than 8 times the weight of keiko's dog. which expression could be used to fine te weight of mila's dog?

The area (in square feet) of an x-foot-wide sidewalk can be modeled by y=-0.002x^2+0.006x. what is the width of the sidewalk to the nearest foot?