The first one on the picture
- 3 = xy + z
xy + z = - 3
subtract z from both sides:
xy +z - z = -3 - z
yx = - 3 - z
Divide both sides by y :
yx / y = - 3 - z / y
x = -3-z / y
y ≠ 0
hope this helps!
Answer:
let the scone be x and the large coffees be y.
7x+4y=$25.76-----equ(I)
2x+5y=$14.92-----equ(2)
make x the subject of the formulae in equation(ii).
x=$14.92/2-5y
x=7.46-5y
Answer:
see below
Step-by-step explanation:
m/n = 1/7
Using cross products
7m = n
This is a direct proportion
