exam Maths Puzzle Numerical Ability

Graph the inequality
3x+y<=5

y=3x+5

Not sure where to go from here

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exam Other Question

Helen Weller invested $15,000 in an account that pays 12% simple interest. How much additional money must be invested in an account that pays 15% simple interest so that the total HI, can someone show me how to rationalize the denominator and simplify the following?
5 / 2 radical x - 3 radical y