factorise
x^2-16y^2
x = -y
3x + 4y = -8
3:3
3x^2+2x+4x^2+5x-7
y = -3x + 4
y = -5x - 17
14+3x<x-6
{2,3,4} U {1,2,a}
-5x+4y>-16
x+2y+3z=6
2
𝑥
+
3
𝑦
𝑧
=
4
2x+3y+z=4
7
10
4x+7y+3z=10 find reduced echolon form
4x+7y+3z=10 reduce echolon form
