book Maths Puzzle Numerical Ability

hey i want you to show me step-by-step how to solve and graph this equation on a graphing calculator and then how to grph it on paper.
y={x+6}

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I am having trouble figuring out this problem. Could you please help me?

9x + 7 = 5x - 3
Two years after an expansion, a company had sales of $42,000. Four years later the sales were $102,000. Assuming that the sales in dollars S and the time in years t are related by a linear equation, find the equation relating S and t.