exam Maths Puzzle Numerical Ability

Please help.

Solve the system by substitution.

4x+2y=8
y=-3x+7

Thanks
JMS

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exam Other Question

Bob's Bank holds a simple discount note in the amount of $8,000. The discount rate was 9% and the term of the note was 150 days. The bank rediscounted the note after 90 days at 7%. The square root of one fifth of a number is 4. Find the number.