Solve, using the substitution method.
5x + 2y = 7
y = x – 7
a. (7, 0)
b.(3, –4)
c, (0, –7)
d.(–1, –8)

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Zach spent 2/3 hour reading on friday a 11/3 hlurs reading on saturday. how much more time did he read on saturday tha on friday