exam Maths Puzzle Numerical Ability

1.solve by graphing
5x-y=3
y=5x-3
2. solve by back substtution
2 4 1 :1
1 -2 -3 :2
1 1 -1 :-1

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exam Other Question

okay. today my teacher went over this, but I still do not understand it. She said to do something like a scale in science "whatever you do to this side, do to the other." but i still dont get it. HELP!!! What is answer for (8b to the second power)(2b to the -8)(2b to the 6)