exam Maths Puzzle Numerical Ability

Solve by the substitution method.
3x + 4y = 20
-6x + y = 32
Will someone please help me with this one.

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exam Other Question
Find the sum or difference. - 11/12 - -7/15






Thanks sooooooo much! Happy Holidays! 4/3r-3 < r-2/3-1/3r