exam Maths Puzzle Numerical Ability

What is the slope-intercept if the line with y intercept 2 and perpendicular to 3x + 2y=6?

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exam Other Question

A car travels 240 miles on 15 gallons of gas. How far can the car travel on 20 gallons of gas? (x-1)(2x+3) = 3

I keep coming up with x=-3/2 or x = 2
but the book is saying x = -2 and x is 3/2
what am I doing wrong