2. By substitution solve -3x-5y-19=0 and -7x+ 3y+1=0
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- 3x - 5y - 19 = 0
3x + 5y + 19 = 0
3x = - 5y - 19
x = - 5/3y - 19/3
- 7x + 3y + 1 = 0
-7(- 5/3y - 19/3) + 3y = - 1
35/3y + 133/3 + 3y = - 1
35y + 133 + 9y = -3
44y = - 136
y = - 136/44
y ≈ 3.091
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