exam Maths Puzzle Numerical Ability

graph the inequality 3x=5y<15

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exam Other Question

How many four-digit numbers can be formed from the digits 0,1,2,3,4,5 if no repetitions are allowed and 0 cannot be the first digit? can you please help me solve and check this problem using the substitution method. (((y=5x 2x+y=28)))