exam Maths Puzzle Numerical Ability

what is the axis of symmetry of a line called?

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exam Other Question

im having a difficult time solving this kind of problem

5x-2y=4
x+2y=8

it says to solve each equation by the addition menthod (*you may have to multiply both sides by -1)

if you can show me the steps and explain them to me thanks.
tring to find out the angle of this triangle. one leg is 75.69, and the hypoteneuse is 94.154. i need to know what the angle of the other corner is.