Question

Solve the system y = x + 2 and y = -x - 3

Answer 1

If you know what y equals (from the first equation), you can substitute it into the second equation and solve for x.

x+2=-x-3 (after substituting x+2 for y)
2x=-5
x=-2.5

Then substitute in the value for x that you found into the first equation to find y.

y=-2.5+2
y=-0.5

You can then check your answer by substituting the values for x and y into both equations to make sure they work out properly.

Answer 2

Can you help with this? 2x - 3y = 7 and 8x - 12y = 5

Answer 3

My guess is that the second system is unsolvable.

Answer 4

If you multiply both sides of the first equation by 4, you get 8x-12y=28. 8x-12y can't be both 28 and 5.