exam Maths Puzzle Numerical Ability

Please graph the inequality 4x+y is greater than or equal to 4

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exam Other Question

please help me to fin the answer of this question : ab+a-b=2001, find the value of a and b. if a and b are a real number. I have a problem that I could use some help understanding how to solve/answer from a homework sheet. x varies directly with y and inversely with z. x=20 when y=8 and z=4. Find x when y=4 and z=8. Thank you