exam Maths Puzzle Numerical Ability

Find an equation for the line passing through the points(8,3) and
(-2,1).Express your answer in standard form.

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exam Other Question

Solve each literal equation for the indicated variable.
A = 1/2h(B + b) (solve for b) Area of a trapezoid
This is the problem in word form, (A) equals one half (h) times (B + b), solve for (b)
Find the values (if any exist) that make the rational expression undefined.

-2x-4
-2x+4 This is supposed to be a fraction but I can't get the underline under
-2x-4.