Match the reasons with the statements in the proof to prove df = ef, given that def is a triangle by definition and angles 3 and 4 are equal. given: def 3 = 4 prove: df = ef

Which is the most efficient first step to solve x in the equation 3.7x - 18 = -4.3x -34 a. add 3.7x to both sides of the equation. b. add 4.3x to both sides of the equation. c. subtract 18 from both sides of the equation. d. subtract 34 from both sides of the equation.

7x+8y=-18, 4x-9y=-3 solve the system of equations

Use set builder notation to represent the following set: { -3, -2, -1, 0}