Can anyone explain to me how to solve systems of equations with three variables? especially for this problem

x-3z=7

2x+y-2z=11

-x-2y+2z=6

Jason ran 325 m farther than kim. kim ran 4.2 kilometers. how many meters did jason run?

20 votes for Erin per 100 votes

Simplify this imaginary number; sqr - 8?

Lucas wrote this number sentence to two different ways to arrange his postcards in an album. 9*4 = * 9 what factor will make Lucas number sentence true?

What is 9/8 minus two thirds and what is the simplified answer

0.884 in standard form

Write a function that represents a parabola that opens upward and has a vertex of (9,11)

A local gaming club has more than 2 but fewer than 20 members. Every member of the group purchased a signed copy of the latest book from the legendary Dumas, for a grand total of $299.

When a number is decreased by 20% of itself, the result is 72. What is the number?

How many strings of 12 decimal digits begin with "248" or consist only of even digits?