Question

I Need Guidance :|

-2x + y = 1
-4x + y = -1

Answer 1

tsolving by substitution or elimination ?

Answer 2

typo...solving

Answer 3

lets try substitution..
take either equation and try to isolate a variable. It does not matter which one. However, it looks like the easiest one to isolate is the y value.

-2x + y = 1 --- add 2x to both sides because what you do on one side of the equal sign, you have to do on the other side.
and we would get : y = 2x + 1

now sub 2x + 1 in for y in the other equation
-4x + y = -1
-4x + 2x + 1 = -1 -- subtract 1 from both sides
-4x + 2x = -1 - 1 -- combine like terms
-2x = -2 -- divide both sides by -2
x = 1

now sub 1 in for x in either equation to find y
-2x + y = 1
-2(1) + y = 1
-2 + y = 1
y = 2 + 1
y = 3

you can then check your answers by subbing them into either equation to see if they come out equal.
-4x + y = -1
-4(1) + 3 = -1
-4 + 3 = -1
-1 = -1 (correct)

so x = 1 and y = 3 or (1,3)

Answer 4

Sorry i didin't get back to you. You explained it very well and i thank you for that.