Answer:
x = 1
y = -3/2
Step-by-step explanation:
Step 1: Arrange the equations with like terms in column.
Step 2: You want 1 set of coefficients that are opposites. This problem already has opposites: -2y and +2y.
Step 3: Solve for x.
4x-2y=7
3x+2y=0
--------------
7x = 7
x = 1
Step 4: Substitute the value of x and solve for y.
4(1)-2y=7
4-2y=7
-2y=7-4
-2y=3
y=-3/2
You find the roots.
Your welcome.
All you do is multiply all the numbers together, and you get V = 168
Step-by-step explanation:





x = 3 or x = -2 we dont use the (-2) because we have a sqrt
So x =3
C = 2 pi r
C = 2 x 3.14 x 12.5
C = 78.5 cm
answer is C. 78.5 cm