Elimination problem 3y-15x=12
5x=y-4
when I rearrange the bottom part and multiply it by 3, literally every number is the opposite of the top half so they all cancel out. I really confused on what the answer would be shown as. thanks!​

the answer is:

the lateral area is equal to

to find the lateral area of the square pyramid, first we need to find the perimeter of the base, and then, find the lateral area using the following formulas:

where,

s, is the base length

slant height, is the height of a the side of the pyramid

we are given:

now, calculating the perimeter of the base, we have:

then, calculating the lateral area:

hence, we have that the lateral area is equal to

have a nice day!