Answer:
[tex]a) - 6a + 70 - 11b[/tex]
[tex] b) - 17a - b[/tex]
Step-by-step explanation:
[tex]7a + 70 - 13a - 11b \\ 7a - 13a + 70 - 11b \\ = - 6a + 70 - 11b[/tex]
[tex] - 5a - 12a + 2b - 3b \\ = - 17a - b[/tex]
hope this helps
brainliest appreciated
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