Combining like terms with negative coefficients

The first instance of the Combining like terms exercise falls under the Algebra I Math Mission.

Types of problems
1. Simplify the following expression - This kind of problem gives an expression and the student is required to get the like terms together and simplify it.

Strategies
1. It is really easy to get the Speed badges and the Accuracy badges in this skill. You can answer problems in less than 5 seconds in it.

2. Just get the like terms(y's as in the problem in the right) together and simplify them : In the problem in the right, get the -3y and the -7y together and combine them). Hence, the answer would be -10y+1.