Solve the system by either the substitution or the elimination method. $$ \left\{\begin{array}{l} {a=b+7} \\ {3 a-15=5 b} \end{array}\right. $$
Added by Richard C.
Step 1
Solve the first equation for one of the variables. We can solve for a in the first equation by subtracting 7 from both sides: $$a = b + 7$$ Show more…
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