exam Maths Puzzle Numerical Ability

My problem is solving and graphing inequalities. This is one of three problems I missed on a recent test.
Solve the inequality 4+3x<28. State the solution set in set builder notat

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exam Other Question

Find the value of "y" so that the line passing through the two points has the given slope: (5,7) , (8,y) m= 4/3 √3 - √1/3




answer is 2√3
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I need to know how to get the answer.