First subtract 11b from both sides and then 11b would cancel out and the 14 would be 3b and then you subtract 3 from both sides and so it would be 3 so you divide 3b by 3 so it would be 3 greater than or equal to b.
The cost to mail a 2-lb package is $7.
The cost to mail a 2-lb, 1 oz package is $7+$0.30(1).
That to mail a 2-lb, 2 oz package is $7+$0.30(2) = $7.60.
Following this pattern, the general formula is f(x) = $7 + $0.30x, where x represents the number of ounces OVER 2 lb.
Answer: The system of equations have many solutions and the correct options are A,B and D.
Explanation:
The given equations are,
..... (1)
.... (2)
Simplify the second equation.


Divide both sides by 3.

It is same as equation (1). Since equation (1) and (2) are same, therefore all the points lies on the line or which satisfies the equation are the solution of the given system of equations.
Test the points whether the point lies on the line or not.
Check for point A(6,-7).


LHS and RHS are equal, therefore the point A is the solution of the system of equations.
Check for point B(2,1).


LHS and RHS are equal, therefore the point B is the solution of the system of equations.
Check for point C(-2,-9).


LHS and RHS are not equal, therefore the point C is not the solution of the system of equations.
Check for point D(-4,13).


LHS and RHS are equal, therefore the point D is the solution of the system of equations.
Therefore the options A,B and D are correct.