For each of the following determine if the given ordered pair is a solution to the given system of equations (1) 3x+y=2
(2) 2x-y=1
Ordered pair (1,-1)
All I need is the answer

2x - 20 = 32 20 - 3x = 8 6x - 8 = 16 -13 - 3x = -10

Solve the following inequalities and show the solution on a number line. 2x+3< 3(4x+5)

Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .