Question #8304a

1 Answer
Mar 8, 2017

#y=x-7#

Explanation:

Mathematically speaking, the word 'sum' loosely means 'put with'. Using mathematical symbols this is written as +

Let the answer be #y#

Let the unknown number be represented by #x#

Breaking the question down into its component parts:

What is ;#color(white)(.)" ".....................->y=?#
the sum of of -7#" "...........->y=-7+#
and; #" "............................->y=-7+?#
a number;#" "....................->y=-7+x#

Writing this the conventional way we have:

#y=x-7#