Question

Solve the following system.
y = x + 3
4x + y = 18
(6, 3)
(3, 6)
(−3, 6)
(3, −6)

Answer 1

(3,6)

Answer 2

\[\begin{pmatrix}
1 & -1 & 3\\
1 & 4 & 18
\end{pmatrix}\to\begin{pmatrix}
1 & 0 & 6\\
0 & 1 & 3
\end{pmatrix}\]\(x=3\), \(y=6\)

Answer 3

y-x=3-(1)
4x+y=18-(2)
(2)-(1)=>5x=15
x=3
Applying th value of x in eqn (1)
y-3=3
y=6