Question

how do you factor 2x^2 + 9xy + 9y^2?

Answer 1

ill start you off
add the first 2 equations to eliminate x ( 2x and -2x will disappear)
y + z = 1.......................(1)
now multiply equation 2 by -2 and add to equation 3
4x - 4y + 2z = 12
-4x + 3y - 2z = -9 add to eliminate x
-y = 3
y = -3
now plug y = -3 in equation (1) above
-3 + z = 1
z = 1+ 3 = 4

now plug y=-3 and z=4 into one of the original equations to find the value of x

Answer 2

you ok with that?

Answer 3

yes thank you. could you help me with one more question? for some reason, this website won't let me ask a question right now.

I have to solve for y and x for these equations, so I can graph them:

1. -3x + y = -6
2. y = -1/2 + 1

Answer 4

subtract to eliminate y:
-3x = -6 +1/2 -1
-3x = - 6 1/2 = -13/2
x = 13/6
now plug y = 13/2 into equation 2 to find value of y