Answer
The price of the plow is \$150.
The price of the tractor is \$1050.
Work Step by Step
Let $p$ be the price of the plow.
The price of the tractor is $7p$.
$p+7p=1200$ $\longrightarrow$combine like terms
$8p=1200$ $\longrightarrow$multiplication property
$8p\div8=1200\div8$ $\longrightarrow$simplify
$p=150$
$7p=7\times150=1050$
