202,104 views
27 votes
27 votes
Y = x - 4
2x + y = 5

solve for x and y

User Brent Chapman
by
3.0k points

2 Answers

10 votes
10 votes

Answer:

X = 2

Y = 1

Explanation:

User Joel
by
2.6k points
27 votes
27 votes

Solve by substitution


y = x - 4 \\ 2x + y = 5 \\ \\ y = x - 4 \\ 2x - 5 = - y \\ \\ y = x - 4 \\ - y = 2x - 5 \\ \\ add \: the \: two \: equations \\ \\ 0 = 3x - 9 \\ 9 = 3x \\ (9)/(3) = (3x)/(x) \\ x =3 \\ \\ substitute \: 3 \: for \: x \: in \: one \: of \: the \: equations \: to \: find \: y \\ \\ y = x - 4 \\ y = 3 - 4 \\ y = - 1 \\ \\ solution \: (3. - 1)

User Cberzan
by
3.0k points
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