2x + 4y = 16
4x + 8y = -16 he chooses to eliminate the variable y

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.

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

The surface area of the triangular prism is .