... labeled (10 a + 5) and its supplement, which is equal to (8b + 1) , total 18 0 degrees: (10 a + 5) + (8b + 1) = 18 0 If b = 8, then: (10 a + 5) + (8(8) + 1) = 18 0 10 a + 70 = 18 0 10 a = 11 0 a = 11 11 The ... – m) = m2 – n2 + m 11 e x 1 = 1 = x ᎏ – 1 = –4; –ᎏ3ᎏ = – ᎏ = ᎏ3ᎏ 4x + = 8x 4(– 1 ) + = 1 + = 1 ᎏ1x = ᎏ = 81 4ᎏ = 8ᎏ – 1 81 8(– ᎏ4ᎏ) 2; 16 x = 16 –ᎏ4ᎏ = ᎏ 16 1 = 1 ; 12 e Angles e and f ... b b c c d d e e Section 2 a a a b b b c c c 10 / • / • • • 11 / / • 12 / • • • • / • • • 13 / / • / • • • • / • • • 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 4...