book Maths Puzzle Numerical Ability

What does the Graph for 2x+3=y look like

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Please help!! I am trying to find out how to do the following problem. Write a equation of the line having slope 5 and y intercept -4/5. the sum of two numbers is 25. 12 less than 4 times one number is 16 greater than 2 times the other number. What is each number?