What is the solution for 5x+7y--6 and x+8y=12?

5x+7y=6 and x+8y=12 multiply the 5 coefficient by opposite of x value so. -5(x+8y)=-5×12. Simplify to get -5x-40y=-60.  Now add the two equations to eliminate x. 5x+7y=6 + -5x-40y=-60.  Equals -33y=-66 Now solve for y by dividing -33 on both sides .  Y= 2.  Now substitute your answer for y into one of the origibal equations to find x .   X+8(2)=12 Now solve x+16=12 Now move 16 to right side .x= -16+12 . Solve to get x= -4.  So now you have your answer for x and y (-4,2) .  

80 square meters.

The formula for the volume of a rectangular prism is (length * width * height), or (area * height), since area = (length * width).

area * height = volume

area * 8 = 640

Divide by 8 on both sides.

area = 640 / 8

area = 80

So, the area of the base of the prism is 80 square meters.

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