x-3y+6z=-8
3x-2y-10z=11
5x-6y+2z=7
Adding equations (1) and (2) together. Multiplying equation (1) by 5 and equation (2) by 3.. so that I can cancel out the z's.
5(x-3y+6z=-8)
3(3x-2y-10z=11)
5x-15y+30z=-40
9x-6y-30z=33
14x-21y=-7
now adding equations (1) and (3) together. Multiplying equation (3) by -3... so that I can cancel out the z's.
x-3y+6z=-8
-3(5x-6y+2z=7)
x-3y+6z=-8
-15x+18y-6z=-21
-14x+15y=-29
now add the system equations together.
14x-21y=-7
-14x+15y=-29
-6y=-36
divide both sides by -6
y=6
My instruct says this not the correct answer for y. She says it is 7. Thats the only hint she will give me.... HELP!
3x-2y-10z=11
5x-6y+2z=7
Adding equations (1) and (2) together. Multiplying equation (1) by 5 and equation (2) by 3.. so that I can cancel out the z's.
5(x-3y+6z=-8)
3(3x-2y-10z=11)
5x-15y+30z=-40
9x-6y-30z=33
14x-21y=-7
now adding equations (1) and (3) together. Multiplying equation (3) by -3... so that I can cancel out the z's.
x-3y+6z=-8
-3(5x-6y+2z=7)
x-3y+6z=-8
-15x+18y-6z=-21
-14x+15y=-29
now add the system equations together.
14x-21y=-7
-14x+15y=-29
-6y=-36
divide both sides by -6
y=6
My instruct says this not the correct answer for y. She says it is 7. Thats the only hint she will give me.... HELP!