exam Maths Puzzle Numerical Ability

how do you solve for a system of linear equations y=2/3x-1 and y=-x+4

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exam Other Question

Simplify (3x^3y)^2 a club with 10 members is to pick a president, vice president, treasurer, and secretary. If each office is to be held by one person and no person can hold 2 offices, in how many ways can those offices be filled?