book Maths Puzzle Numerical Ability

ok I am given the directions-Find the slope of the graph of the linear function f and the problem is....f(2)=-3, f(3)=9

how do i find the slope?

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book Other Question

WRITE AN EQUATION OF THE LINE THROUGH THE GIVEN POINTS

(-4,-8) , (0,2) An 8-inch-square picture is to be enlarged so it covers an area of 100 inches.How much longer will each side of the enlarged picture be?