Question

Solve the following system of equations:

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

(3, 1)

(-1, 3)

(-1, -3)

(1, 3)

Answer 1

-2x + y = 1 ----> y = 2x + 1
now sub 2x + 1 in for y in the other equation
-4x + (2x + 1) = -1
-2x + 1 = -1
-2x = -1 - 1
-2x = -2
x = 1
now sub 1 in for x in either equation to find y
-2(1) + y = 1
-2 + y = 1
y = 1 + 2
y = 3

solution is : (1,3)

you can even check your answer ...
-4x + y = -1
-4(1) + 3 = -1
-4 + 3 = -1
-1 = -1 (correct)

Answer 2

Thanks :)

Answer 3

sure thing :)