exam Maths Puzzle Numerical Ability

I think that I have to see if x1 and x has a solution and x2 and x have a solution and if they do the x is an element of span(x1,x2)

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exam Other Question

Find the equation, in slope-intercept form, of the line that passes through the points
(-7, -2) and (-4, 1). The volume V as a mass of gas varies directly as the temperature T and inversly as the pressure P. If V=242.0 inch cube when T= 220 degrees and P = 10 pounds square, what is the volume when T = 190 degrees and P = 20 pounds per inch square?