Answer:
[tex]r=64[/tex]
Step-by-step explanation:
First, let's start with what we have. If we use [tex]y=mx+b[/tex] here's what we can put in:
[tex]y=-4x+b[/tex]
Then we can use one of the given points to find the y-intercept. Since the only complete one is (12,10), we'll use that.
[tex]10=-4(12)+b\\10=-48+b\\58=b[/tex]
So now we have [tex]y=-4x+58[/tex].
Now we can use our other point with the missing y-value and solve for y.
[tex]r=-4(-2)+58\\r=64[/tex]
So the missing value is 64.
Hope this helps!
