book Maths Puzzle Numerical Ability

The product of two consecutive positive integers is 62 more than the next integer, what is the largest of the integers?

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book Other Question

I need to graph 4x - 7y = 12. I tried to re-write in in intercept slope form but I get y = 4/7x - 12/7 which does not seem right because I cannot plot on graph paper a y-intercept 425/604=425*100/604=70.36% and 230/344=230*100/344=66.86%
when compared 70.36%>66.86%

is there a way to increase the validity of my findings?