7.5
Symmetry, which states that if A = B then B = A Put A = 4 and B = x + y
X= (b-c)/a
x = (y-b)/m
No, A+B is left as A+B AB would be A x B
x=b-a
2x - 13x + 42 = x +ax + b a + b = 2(x - 6.5x + 21) = 34 = a + b
7.5
x + y + z = 0 x = a - b, y = b - c, z = c - a, therefore a - b + b - c + c - a = ? a - a + b - b + c - c = 0
Symmetry, which states that if A = B then B = A Put A = 4 and B = x + y
Ax + B = Bx + C Ax - Bx = (C - B) x (A - B) = (C - B) x = (C - B) / (A - B)
X= (b-c)/a
yes
x = (y-b)/m
2
No, A+B is left as A+B AB would be A x B
42 72