Solve for x and y (use elimination or substitution). show work.

7x+3y-1 = 10x -7y+9   as vertical angles

7x+3y-1 + x = 180  as supplementary angles

So, we have system of equations:

7x+3y-1 = 10x -7y+9 (1)

7x+3y-1 + x = 180     (2)

1) Simplify equation  (1)

7x+3y-1 = 10x -7y+9   > -3x +10y =10

2) Simplify equation (2)

7x+3y-1 + x = 180   > 8x +3y = 181

3)    

(-3x +10y =10)*8    > -24x+80y =80

( 8x +3y = 181)*3     > 24x + 9y = 543

4)

 -24x+80y =80

+24x + 9y = 543

         89y = 623

             y = 7

5) -3x +10y =10

-3x + 10*7 =10

-3x +70 =10

-3x = -60

x=20

Answer : x=20, y = 7

18.8 cubic inches.

step-by-step explanation:

volume of a cone = πr²h

r = 1.5 inches

h = 8 inches

pi = 3.14

volume of our cone = × 3.14 × 1.5² × 8 = 18.84 square inches

or equals to 18.8 square inches rounded up to nearest tenth.

125 yards

step-by-step explanation:

i take 75 plus 50.