Volume of the pyramid = 40 cubic units
Solution:
Let us find the volume of the pyramid.
Area of the base = 
= 10 square units
Area of the base (B) = 20 square units
Height of the pyramid = 12
Volume of the pyramid = 
cubic units
Volume of the pyramid = 40 cubic units
(6x+9y=78) - (6x+4y=38) = (5y=40) = y=8
(2x+3(8)=26) = (2x+24=26) = (2x=2) = x=2
The new coords are (2,-3) the new y coord is -3
In order to solve an equation for a variable, we need to isolate that variable on one side of the equation (either left side or right side).
Following are some steps to solve equation/inequality in one variable:
1) Get rid constant number from on side by applying reverse operation of addition or subtraction.
2) Get rid variable terms from other side by applying reverse operation of addition or subtraction.
3) Combine like terms on both sides.
4) Get rid any coefficent ( a number in front of a variable) by dividing from both sides.
5) Finally you get a variable on one side and solution on other side.
