Choose the equations that have been solved correctly for the variable that is in bold.

v =
1
3
πr2h → h =
3v
πr2
v =
1
3
πr2h → h =
v
3πr2
p = 2w + 2l → w = p - l
p = 2w + 2l → w =
p-2l
2
a = πr2 →
r =

a
π
a = πr2 →
r =

a
π
y = mx + b → x =
y - b
m
y = mx + b → x = y -
b
m
a =
b - c
2
→ b = 2(a + c)
a =
b - c
2
→ b = 2a + c

answer:

b = 2a + c

step-by-step explanation:

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x