exam Maths Puzzle Numerical Ability

how do you graph . 4x + y ≥ 4 and 3x -4y < 12

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exam Other Question

Given a= x(^1/2)-4x(^-1/2). What is the value of 1/a^-2??? Solve each system of equaions by using substitution.

x+3y=13
-3+2y=27