Question

What is the value of the x variable in the solution to the following system of equations?
7x - 2y = 21
4x + y = 57

Answer 1

\[x=\frac{ 2y }{ 7 }+3\]
and
\[x=\frac{ 57 }{ 4 }-\frac{ y }{ 4 }\]

Answer 2

Hope I helped :) Best response me?

Answer 3

lol its funny cus nun of those are in the answer box

Answer 4

Really?

Answer 5

ill show yu the answers .

Answer 6

21

-21

9

-9

Answer 7

one way to solve this is to use the substitution method - have you heard of it?

Answer 8

cant remember

Answer 9

you are given two equations with two unknowns:
1) 7x - 2y = 21
2) 4x + y = 57

first, use the second equation to get an expression for y in terms of x - can you do that?

Answer 10

nope

Answer 11

so what methods have you been taught for this type of problem?

Answer 12

I would suggest you read through this to gain an understanding of the substitution method and then you you try and attempt to solve this question: http://www.basic-mathematics.com/substitution-method.html

if you are still stuck after reviewing the method then let me know and I will try and explain it.