book Maths Puzzle Numerical Ability

3/4(3t-4)=5 answer in book is 8

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A store has all board games on sale for 25% off the regular price. A checker set has a sale price of $12. It is then moved ot a clearance table where every item is discounted 40% 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