Solve the system of equations by substitution. What is the solution for x? 2x + y = 1 4x + 2y = −2

Question

anonymous · Answer

Substitution means that you must solve for one variable in one equation ans then replace the value on the other.

from the first equation we get y=1-2x

Then replacing on the othe we get
4x+2(1-2x)=-2

That is a one variable equation.

anonymous · Answer

2x + y = 1 ---> y = 1 - 2x
now sub 1 - 2x in for y in the other equation...
4x + 2y = - 2
4x + 2(1 - 2x) = - 2 (distribute the 2 through the parenthesis)
4x + 2 - 4x = - 2
4x - 4x = -2 -2
0 = - 4

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