If y= -252 when x= 84, what is y when x= 74?

Answer 1

You need more information

There are an infinite number of linear equations that go through the point (x,y)=(84,-252)

y could take on any value when x=74, if this is all you know

You need more information, such as the slope or another point on the line

You could call the slope m and write an equation for the slope

m=(y+252)/(x-84)

rewrite solving for y

y+252=m(x-84)

y=m(x-84)-252

Now plug in your x=74

y=m(74-84)-252

y=-10m-252

When x=74 y=10 times the slope minus 252

If the slope is zero, y=-252

If the slope is one y=-242

if the slope is -1 y=-262

if the slope is 30 y=48

the y value depends on the slope

all we know about the slope is that it can't be infinite or vertical, as then x cannot be any value other than 84