Jamb Mathematics 1985 Past Questions and Answers

Question 21:

• JAMB 1985

Solve for (x, y) in the equation 2x + y = 4: x^2 + xy = -12

A. (6, -8): (-2, 8)
B. (3, -4): (-1, 4)
C. (8, -4): (-1, 4)
D. (-8, 6): (8, -2)
E. (-4, 3): (4, -1)

Question 22:

• JAMB 1985

Solve the following equation \(\frac{2}{2r - 1}\) - \(\frac{5}{3}\) = \(\frac{1}{r + 2}\)

A. (\(\frac{5}{2}\), 1)
B. (5, -4)
C. (2, 1)
D. (1, \(\frac{-5}{2}\))
E. (\(\frac{-5}{2}\), 1)

Question 23:

• JAMB 1985

Solve the simultaneous equations 2x - 3y + 10 = 10x - 6y = 5

A. X = 2\(\frac{1}{2}\), y = 3\(\frac{1}{2}\)
B. X = \(\frac{1}{2}\), y = \(\frac{3}{2}\)
C. X = 2\(\frac{1}{4}\), y = 3\(\frac{1}{2}\)
D. X = 2\(\frac{1}{3}\), y = 3\(\frac{1}{2}\)
E. X = 2\(\frac{1}{3}\), y = 2\(\frac{1}{2}\)

Question 24:

• JAMB 1985

If f(x - 2) = 4x² + x + 7, find f(1)

A. 12
B. 27
C. 7
D. 46
E. 17

Question 25:

• JAMB 1985

In \(\bigtriangleup\) XYZ, XY = 13cm, YZ = 9cm, XZ = 11cm and XYZ = \(\theta\). Find cos\(\theta\)^o

A. \(\frac{4}{39}\)
B. \(\frac{43}{39}\)
C. \(\frac{209}{3}\)
D. \(\frac{43}{78}\)