Solve the given system of 3 -variable equations by hand with substitution. 1. \( \left\{\begin{array}{c}x+2 y-7 z=28 \\ y+z=18 \\ 5 z=15\end{array}\right. \) 5z

\( \equiv \) (i) Listen A bowl contains blueberries and strawberries. There are a total of 12 berries in the bowl. The ratio of blueberries to strawberries is 1 to 2 . How many of each berry are in the bowl? \( \square \) blueberries strawberries

Three consecutive numbers their sum is 48 write an equation express that is .... \( \begin{array}{l}3 x+2=48 \\ 3 x+4=48 \\ 3 x+3=48 \\ 3 x-3=48\end{array} \)

which of the following equations is not a linear function? 1) \( 2 y-3 x=1 \) 2) \( 4 x^{2}+y^{2}=4 x y \) 3) \( y=2 \) 4) \( x=2 \)

4. Make \( c \) the subject of \( g=\frac{c+3}{4+c}-7 \)

question 4. Solve \( 3 x+2=2+4 x \)