X + y = 46 x is six more than four times the value of y so replace x with that 6+4y + y = 46 add 4y+y=5y so 6+5y=46 subtract 6 from both sides to remove the 6 in the left. 5y = 40 Divide both sides by 5, the coefficient of y. 5y/5=y and 40/5=8
The volume of the second prism is 576 cubic centimeters. Since both prisms have the same height, I solved for the height using the data given with the first prism (I got 6 centimeters for the height). And then I calculated for the volume of the second prism.