Question

Which of the following ordered pairs represents the solution to the system given below?

2x + y = 20
4x − 2y = 40

A) (10,0)
B) (0,10)
C) (4,2)
D) (10, -10)

Answer 1

We can use elimination to solve the problem :) do you know what the first step would be?

Answer 2

no @kidrah69

Answer 3

Alright :)
First we need to get opposite signs!
\[-2(2x + y = 20)\]
distribute -2 into everything in the parentheses

Answer 4

-2 * 2x=?
-2*y=?
-2*20=?

Answer 5

-4
???
-40 @kidrah69

Answer 6

1) -4x
2)-2y
3) -40
Moving on...
\[ \frac{ -4x-2y=-40 }{ 4x − 2y = 40 } \]

Answer 7

-4-4=?
-2-2=?
-40+40=?

Answer 8

-8
-4
0

Answer 9

My mistake sorry -4+4=0
ok
so we have
-4x=0
-4 divided by 0=?

Answer 10

0

Answer 11

y value is 0

Answer 12

Without doing any extra work what is the answer? :)

Answer 13

zero ?

Answer 14

@kidrah69