Answer:
proportional
Step-by-step explanation:
I would use elimination
2x+3y = 7
2x-y = -5
Subtract those equations
4y = 12
Y = 3
Now plug in 3 for any y value
2x - 3 = -5
2x = -2
X = -1, y = 3
Radius is 5, diameter is 10
because 4/3 x 5^3 pi = 500/3 pi cm^3
Have a look at the attached image.
