Question

Solve the following system of equations: -2x + y = 1 -4x + y = -1

Answer 1

do you prefer substitution or elimination ?

Answer 2

subsitution

Answer 3

-2x + y = 1
y = 2x + 1
now sub 2x + 1 in for y in the other equation
-4x + y = -1
-4x + 2x + 1 = -1
-2x = -1 - 1
-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 = 2 + 1
y = 3

check...
-4x + y = -1
-4(1) + 3 = -1
-4 + 3 = -1
-1 = -1 (correct)

x = 1 and y = 3

any questions ?

Answer 4

holy crap... nope, algebra 1 is the only math i had a problem with. thank you

Answer 5

anytime :) algebra 1 is my fav