For an instance, i stands for the money that you have, and b stands for the money that brother has. An equation system based on the problem would be i + b = 42 (equation 1) i = 3b (equation 2)
Use substitution method to solve the problem substitute 3b into i in the equation 1 i + b = 42 3b + b = 42 4b = 42 b = 42/4 b = 10.5
substitute the value of b into the equation 1 i = 3b i = 3(10.5) i = 31.5
Speed limits are used in most republics to set
the greatest speed at which road cars may legally journey on specific stretches
of road. In the problem, the car is moving 60 mph and was speeding over 5mph
above the speed limit. So therefore, 60 – 5 = 55mph is the speed limit for this
road.