Help Pleaseeeee

A bakery sells muffins for $3.50 each. A beverage is $1.75. A class purchases 32 items and spends a total of $87.50. Write the system of equations and represent it as a matrix equation. b. State the value of the determinant. c. Use matrices to solve the system. Find the number of muffins and the number of beverages purchased.

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Help Pleaseeeee

A bakery sells muffins for $3.50 each. A beverage is $1.75. A class purchases 32 items and spends a total of $87.50. Write the system of equations and represent it as a matrix equation.  b. State the value of the determinant. c. Use matrices to solve the system. Find the number of muffins and the number of beverages purchased.

dumbcow · Answer

M + B = 32 3.5M + 1.75B = 87.50 Matrix [ 1 1] [M] [32] [3.5 1.75] [B] = [87.50] Find determinant http://en.wikipedia.org/wiki/Determinant#2.C2.A0.C3.97.C2.A02_matrices Find inverse matrix http://en.wikipedia.org/wiki/Inverse_matrix#Inversion_of_2.C3.972_matrices Solve $$X = A^{-1} * B$$

anonymous · Answer

i dont get how to do the determinant partt

anonymous · Answer

@PONYpony did you get this

anonymous · Answer

@dumbcow could you help me with this

anonymous · Answer

@Opcode²

anonymous · Answer

@Melissy what is the dimension of the matrix. (Do you know how to find the dimension?)

anonymous · Answer

yes i have found the dimension
but im just not sure how to solve the matrix

anonymous · Answer

Tell me the dimension.

anonymous · Answer

i got it to be -1.75

ipwnbunnies · Answer

Sorry, not sure what it means by putting the equations in a matrix. .-.