WILL FAN AND MEDAL. I NEED HELP TO FIGURE THIS OUT

Question

cryleeb · Answer

Consider the following equations:
–x – y = 1
y = x + 3
If the two equations are graphed, at what point do the lines representing the two equations intersect? (4 points)
 
Select one:
a. (–1, 2)
b. (–2, 1)
c. (1, –2)
d. (2, –1)

anonymous · Answer

Just insert the bottom equation into the to one
-x-(x+3)=1
solving this gives
x=-2
inserting this in the second equation gives
y=-2+3=1
so the point is (-2,1)

cryleeb · Answer

thanks so much!

cryleeb · Answer

@bts30 do you think you can help me with one more thing?

cryleeb · Answer

y = –2x + 8 
y = x – 1 
I have to solve using substitution but I'm not sure how to if they are both in slope-intercept form.

anonymous · Answer

you just do the same thing as before inserting the bottom equation into the top one

cryleeb · Answer

i dont get how to insert the bottom equation into the top if they are both in y-intercept form though?

cryleeb · Answer

i know how to do it that way, basically my question is how do I solve for x in: y=x -1