Answer:
Step-by-step explanation:
Given: The mystery number is a four-digit number.
The digits used to make the number : 5, 4, 7, and 3.
Since , 5 and the 7 are the two middle digits.
Then , the number would look like
The 5 comes after the 7.
Then , the number would look like [i.e.
is not representing the mystery number]
The 3 is not the first digit, then 4 must be the first digit.
Hence, the mystery number should be :
We are given
First equation:
we can use formula
slope is m=1
y-intercept is b=-1
Second equation:
we can use formula
slope is m=-2
y-intercept is b=5
Graph:
We can see that
both curves intersect at (2,1)
so, solution is x=2 and y=1.................Answer
