exam Maths Puzzle Numerical Ability

Solve and graph the solution set. 3x => 7x + 20 (I am figuring I need a line graph like this??

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-5 0
Please help...

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exam Other Question

0.7n-15+n=2n-8-0.4n and can you please show me how to check it, thanks 1)what is the slope of the line givin by y= -3x+2

2) write the equation, in slope-intercept form, of the line containing the points (-1,5) and (1,3)