exam Maths Puzzle Numerical Ability

how too write an equation os a line in slope-intercept form that passes through (1,-2) and whose slope is 7

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Im really confused could someone please help?

Solve by factoring:

7a2+9a+2=0
How do I simplify this and express in scientific notation:

The ratio 35,960,000 miles : 3,664,000,000 miles, the ratio of the distance of the sum from Mercury to its distance from Pluto

Help!