What is the solution to the following system of equations?
-5x-4y=-4
25x+20y=20
a. (4, –4)
b.(8, –9)
c. no solution
d. infinite solutions

Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it. how many multiple-choice questions are on the test?

Which value would be a solution for x in the inequality 47-4x< 7

3x + 4y = 5 x- 3y = -7 solve by substitution