-1/5y=-6

-2/3t=-16

1/3y=5 2/3

-1/2b=-8

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1,2,4: Multiply both sides by the inverse coefficent of y, t and b respectively.

For 3 convert the right side to a simple fraction and do the same as above.

And, yes, post your answers, to let us see if you properly understood.

Area of a right angle triangle? Need fromula.

1/2 the area of a rectangle. Draw the picture.