Question

Need help with this math question.

Answer 1

Hey there,

1.)
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And the rest would be. . .

division property of equalitysubstitution property of equalitymultiplication property of equalitysubtraction property of equalitysimplify

Answer 2

10a+35b=0; 21a-35b=217 ...associative property of addition
31a = 217 .............addition property of equality
a = 7 .....................division property of equality
2(7) +7b = 0 --------------substitution property of equality
14+7b = 0 -----------------mulplication property of equality
7b = -14 --------------subtraction property of equality
b = -2 ----------------simplify