Number

Statistics and Probability

Algebra: 3.3 Equations

Solve the following linear equations.

1.

$3(3x+6)=72$
Multiply out the bracket and rearrange to get the unknown, $x$, on one side of the equation. Then you can solve for $x$. $3x = 72 3 −6 3x = 24 x = 6$

2.

$3 z −4=6$
Multiply up by $z$ and rearrange to collect the unknown varible, $y$, on to one side of the equation. $3−4z = 6z 3 = 10z z = 3 10$