Solve the system of equations 9x-6y=-12 and 8x-5y=-8 by combining the equations

  (x, y) = (4, 8)

Step-by-step explanation:

We can multiply the first equation by -8 and the second by +9, then add the result.

  -8(9x -6y) +9(8x -5y) = -8(-12) +9(-8)

  -72x +48y +72x -45y = 96 -72

  3y = 24

  y = 8

Substituting for y in the first equation, we have ...

  9x -6(8) = -12

  9x = 36 . . . . . . add 48

  x = 4

The solution is (x, y) = (4, 8).

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)

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step-by-step explanation: