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Answer:
[tex]a=-13[/tex]
Step-by-step explanation:
We can use substitution to find the value of [tex]a[/tex]:
[tex]qt+a=-1[/tex]
[tex]3(4)+a=-1[/tex]
[tex]12+a=-1[/tex]
[tex]a=-13[/tex]
Hope this helps :)