Step-by-step explanation:
You're asking why

let's transpose the first equation for y
-2x-6y=18
-6y=18+2x
6y=-18-2x
y=-18/6-2x/6
y=-3-⅓x as required
Well 41 divided by 6 is 6.8333333333333 so you just need to subtract .833333333333
I hope this answered your question
Answer:
D 45.6 Square centimetres
Step-by-step explanation:
8 cm time 5.7 cm
Answer: 51
80+49=129
180-129= 51