exam Maths Puzzle Numerical Ability

square root of 3x+6 minus 9=0

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exam Other Question

Sally bought three chocolate bars and a pack of gum and paid $1.75. Jake bought two chocolate bars and four packs of gum and paid $2.00. Find the cost of chocolate bar and the cost of a pack of gum. Solve the system by substitution.
3x - y = -7
x + y = -9