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babymother [125]
4 years ago
10

X+2y=14 Y=3x-14 Substitution

Mathematics
2 answers:
zysi [14]4 years ago
6 0
\left \{ {{x+2y=14} \atop {y=3x-14}} \right.\\\\Substitution\\\\
x+2(3x-14)=14\\
x+6x-28=14\\
7x-28=14\ \ \ | add\ 28\\
7x=42\ \ \ | divide\ by\ 7\\x=6\\
y=3x-14=3*6-14=18-14=4\\\\Solution:\\ \left \{ {{y=4} \atop {x=6}} \right.
PolarNik [594]4 years ago
4 0
X+2y=14, okay so you have to write X+2(3x-14)=14
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