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Activity 1: Identify the letter of the correct answer.

1. Which of the following illustrates a linear equation in two variables?
A.x + 1 = 4
B. x+y=4
C. y = 4
D. x+y>4

2. Which of the following does NOT illustrates a linear equation in two variables?
A. 2x + 3y = 8
B.2y = 3x +7
C. 3x² + 2y = 7​