Which statement describes the system of equations? -5x - 4y = -4
25x + 20 = 20

a. it has one solution (4, –4).
b. it has one solution (8, –9).
c. The system has no solution.
d. The system has infinitely solutions.

(help me plz)

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

step by step explanation: when u removing the parentheses and combined them that would be : x+3y-x-y=2y

тнєу єα¢н яαи 32 мιℓєѕ

step-by-step explanation:

нσρє ι ¢συℓ∂ нєℓρ уσυ συт тσ∂α!