exam Maths Puzzle Numerical Ability

Can you please help me solve the equation...instructions...solve the system by graphing.

4x + 2y = 10
y = 4

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exam Other Question

twice the greater of two consecutive odd integers is 13 less than three times the lesser. find the number

define a variable
write equation
solve

can you show me how to do this problem please?
6 square root 5y - square root 20y