When Joe solved a system using substitution, he got 7 = 9. What can Joe conclude? *
The solution to the system is (7.9).
The system of equations does not have a solution,
The work must be incorrect because it is not possible to get this equation
The system of equations has infinitely many solutions,

Tracy solved the following problem. which of the statements is true? 9 ÷ 3 + 6 × 2 3 + 6 × 2 9 × 2 18 her answer is correct. her answer is incorrect. she should have multiplied before dividing. her answer is incorrect. she should have multiplied before adding. her answer is incorrect. she should have added before dividing.

The tile along the edge of a triangular community pool needs to be replaced? ?

The statements below can be used to prove that the triangles are similar. ? △abc ~ △xyz by the sss similarity theorem. which mathematical statement is missing? ∠b ≅ ∠y ∠b ≅ ∠z