15) n-4-9
16) 4n-n
17) –3x – 9+15x
18) -9k + 8k
19) -16n - 14n
20) 15n - 19n
21) -4 +7(1 – 3m)
22) –5n+ 3(6 + 7n)

If sin(x) = 0 and cos(x) = 1, what is tan(x)?

2x minus y equals 6, x plus y equals negative 3

Examine this system of equations. what integer should the second equation be multiplied by so that when the two equations are added together, the x term is eliminated? 3/4x+1/7y=6 1/8x-3/5y=16