linear equations
100

y = 2 × (-1) + 1 = -1

-1

200

y = 2 × 0 + 1 = 1

0

300

y = 2 × 1 + 1 = 3

1

400

y = 2 × 2 + 1 = 5

2

500

 y = 2x + 1

1