Use proportions , it helps
200+40=240
each train cost 10
take 240/10=24trains
Area of Shaded triangle as a whole: 136cm^2
Area of Rectangle 1 : 20cm^2
Area of Rectangle 2 : 6cm ^ 2
Area of the shaded region :
136 - (20+6)
136 - (26)
110 cm^2
The x=7y-4 one and put it to where the x in the other equation is.
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