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It is the question of class 10 Maths

Complete the statements about the system of linear equation respresented by the tables the equation respented the left table is

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

Graph the equationy= x+3[tex]y = x + 3[/tex]