Do you have anything to replace the variables with?
If not, then I think you should replace x by 0 and find y. Then replace y by 0 and find x.
Maybe, not sure.
What are the coordinates of these two equations after solving using substitution?
2x-y=-11 and x+4y=17
2 answers
an equation has no coordinates.
If you want the coordinates of the two lines' intersection, then just solve for x and y.
The first equation tells you that
y = 2x+11
so use that in the 2nd equation and you have
x+4(2x+11) = 17
x+8x+44 = 17
9x = -27
x = -3
Now, y = 2x+11 = 2(-3)+11 = 5
So, the lines intersect at (-3,5)
Just to be sure, check that (-3,5) lies on each of the original lines.
If you want the coordinates of the two lines' intersection, then just solve for x and y.
The first equation tells you that
y = 2x+11
so use that in the 2nd equation and you have
x+4(2x+11) = 17
x+8x+44 = 17
9x = -27
x = -3
Now, y = 2x+11 = 2(-3)+11 = 5
So, the lines intersect at (-3,5)
Just to be sure, check that (-3,5) lies on each of the original lines.
11 answers