Match the systems of equations to their solutions. 2x + y = 12             x = 9 − 2y x + 2y = 9 2x + 4y = 20 x + 3y = 16 2x − y = 11                y = 11 − 2x 4x − 3y = -13                y = 10 + x -3x + 3y = 30 2x + y = 11 x − 2y = -7 x = 2, y = 7  x = 5, y = 2  x = 3, y = 5  x = 7, y = 3

40 minutes

step-by-step explanation:

add the time and multiply by 2

explanation:

step-by-step explanation:

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like: