Help me plz ik am so annoying with this math but it just tht I rlly don’t have clue how to do these

Solve x+3y=6 and 4x-6y=6 by elimination . show work !

Agrasshopper weighs 0.89 grams. express the grasshopper’s weight in scientific notation.

What is solution for the following system of equations, 2x+8y=4 and x=-3y+5 1) x=14 y=-3 2) x=2 y=-3 3) x=-3 y=-3 4)x=12 y=5