<PRE><B>Question 760368</B>
-8a+b=70
b=8a+70
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8a+2b=-52
8a+2(8a+70)=-52
8a+16a+140=-52
24a=-52-140
24a=-192
a=-192/24
a=-8
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8*-8+2b=-52
-64+2b=-52
2b=-52+64
b=12/2
b=6
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-8*-8+6=70
64+6=70</PRE>