Exam Maths Puzzle Algebra

Can someone please show me how to do the following problem:

Solve for X, Y, and Z in the following:

22x + 5y + 7z = 12, 10x + 3y + 2z = 5, 9x + 2y + 12z = 14

Read Solution (Total 0)

Exam Other Question

A boat went 10 miles upstream and 10 miles downstream. If the current is 3 mph what is the rate of the boat? Q1. Solve 1/8 = 4^5x+4

Q2. Solve 1/125 = 25^8x-5

Choose the exponential function that is satisfied by each of these coordinate pairs: (0,1), (-1,2) and (2, 1/4).