Solve the system of equations by substitution.

3x + 4y = 31

2x - 4y= -6

a. (4, 5)
b. (5, 4)
c. (-5, 12.5)
d. (5, -4)

What is the value of the expression below? (81^2)^1/8

Given a: b and b: c, find a: b: c. write the ratio in simplest form. a: b=6: 10 and b: c=21: 33

Kyle and elijah are planning a road trip to california. their car travels 3/4 of a mile per min. if they did not stop driving, how many miles could kyle and elijah drove in a whole day? ? 1 day = 24 hours. plzzz write a proportion i will give you 100 points