book Maths Puzzle Numerical Ability

Derive a set of inequalities that describes the region. The picture is of a parallelogram with points (1,1), (7,2), (3,6), and (9,7). Thanks, Julie

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book Other Question

The question is: The formula V=De(raised) to the -kt+Vr
gives the value of an item V as a function of time t, where Vr is the residual value, D is the difference of the items orig Is the equation 4x-1=16 linear?