exam Maths Puzzle Numerical Ability

Solve by graphing.
2x+y=1
x-y=2

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exam Other Question

Solve the system by addition.
x + y = 4
x – y = 10 CAN YOU HELP ME PERFORM THE INDICATED OPERATIONS. Thank you
2x + 2y * 15
_______ ________
7 6x + 6y

a^3b^4 * a^5b^7
________ ________
-2ab^2 a