One way of solving systems of linear equations is by adding a multiple of one equation to the other. the multiplier for one equation is chosen so that one of the two variables will cancel out in the sum. what should you multiply the equation y=0 by so that when added to x+y=40 the variable y will cancel out?

Question

Mathematics

Ansley Vincent

14 September, 11:26

One way of solving systems of linear equations is by adding a multiple of one equation to the other. the multiplier for one equation is chosen so that one of the two variables will cancel out in the sum. what should you multiply the equation y=0 by so that when added to x+y=40 the variable y will cancel out?

+4

Answers (1)

Know the Answer?

Gilbert Forbes · Answer 1

We want to use elimination to solve

y = 0 (1)

x + y = 40 (2)

Multiply (1) by - 1 to eliminate y.

-y = 0 (3)

Add (2) and (3).

x + y + (-y) = 40 + 0

x = 40

Answer: Multiply by - 1.