book Maths Puzzle Numerical Ability

3a+6b=-15
a=-2b-5

Use the substitution method to solve the system. If its dependant or inconsistant, so indicate.

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book Other Question

In 1950, the average price of a car was about $2000. To compare dollar amounts over time, use the formula V=a/s(c), where A is the old dollar amount, S is the starting year's Cons What is a good way to change

3X+15=30

into a good word problem?