Use the echelon method to solve the system of two equations in two unknowns. check your answers.

5x - 4y = -2
6x - y = 9

Find the exact value of each of the following. in each case, show your work and explain the steps you take to find the value. (a) sin 17π/6 (b) tan 13π/4 (c) sec 11π/3

What is always true about a positive integer raised to a negative odd power?

What is 140% of 25? because i need