using elimination method, solve the simultaneous equations: 9x+7y=20 and 7x+9y=30

using elimination method, solve the simultaneous equations: 9x+7y=20 and 7x+9y=30
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line 1...9x+7y =20 or 81x+63y=180

line 2...7x+9y=30  or 49x +63y=210

line1-line2...(81x-49x) +(63y-63y)=180-210

32x=-30

x=-30/32

x=-0.9375

from line 2, 9y=30-7x...=30+6.5625...=36.5625

y=36.5625/9

y=4.0625
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