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---->(-1)
-4x + y = -1
-------------
2x - y = -1 (result of multiplying by -1)
-4x + y = -1
-------------add
-2x = -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 = 1 + 2
y = 3

answer : x = 1 and y = 3......(1,3)

Answer 2

any questions ?

Answer 3

nope, Thank you :)

Answer 4

no problem :)