exam Maths Puzzle Numerical Ability

2x+3y=21
-3x-6y=-24

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exam Other Question

(Use 10 steps)
Given: a and b intersect
Angle 1 is congruent to angle 2
Prove: a is perpendicular to b
Pls. use the two column proof...
The statement and the reason for this
Simplify the rational expression

x^2-7x+12/x^2-16