So,
The slope-intercept form is as follows:
y = mx + b
"m" is the slope, and "b" is the y-intercept. The y-intercept for this equation is (0,b).
Our equation is

That means that

is the slope, and -3 is the y-intercept.
He will weigh 198 lbs. you add 3 lbs to his original weight for each year.
I hope this helps you
x=y+4
3 (y+4)+y=8
3y+12+y=8
4y= -4
y= -1
x= -1+4
x=3
(3, -1)
The value of 7 in that number is 7 because the 7 is in the ones place
P=2(l+w) hope this helps :)