1.[tex]-5xy + (-6xy) = -11xy[/tex]
2. [tex]-4x^{2}y - 8x^{2}y[/tex]
[tex]-4x^{2}y + (-8x^{2}y) = -12x^{2}y[/tex]
3. [tex](3a + b - 3) \\- (2a + 2b - 2)\\--------\\a - b - 1[/tex]
4. [tex](7y^{2} + 3z +5)\\- (2y^{2} - z - 6)\\ ---------\\5y^{2} + 4z + 11[/tex]
The answers are after the equal sign
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