exam Maths Puzzle Numerical Ability

y=2x+1

What value of the variable y is associated with the following values for the variable of x?

a x=1
b x=3
c x=0

variable x
a

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exam Other Question

How do I solve using a system of two equations in two variables?

The sum of the digits of a two-digit number is 9. The value of the number is 12 times the tens digit. Find the number.

I think the first equation is x+y=9 x + 4 > 0 and 4x > 0

please help with this.