-−53
-1
-13
13
Correct answer is D
8x-1 = 14
23(x - 1 = 2-2
3x - 3 = -2
3x = -2 + 3
3x = 1
x = 13
Solve the simultaneous equations x + y = 2 and 3x - 2y = 1
x = 2 and y = 1
x = 1 and y = 1
x = 1 and y = 2
x = -1 and y = 1
Correct answer is B
x + y = 2........... (i)
3x - 2y = 1......(ii)
From (i): x = 2 - y ..........(iii)
subt. (2 - y) for x in (ii)
3(2 - y) 2y = 1
6 - 3y - 2y = 1
-5y = 1 - 6 = -5
y = −5−5 = 1
subst. (i) for y in (iii)
x = 2 - 1 = 1
x = 1, y = 1
If x = 3, Y = 2 and z = 4, what is the value of 3x2 - 2y + z?
17
27
35
71
Correct answer is B
x = 3, y = 2, z = 4
3x2 - 2y + z
= 3(3)2 - 2(2) + 4
3(9) - 4 + 4 = 27
For what value of x is the expression 2x−1x+3 not defined?
3
2
12
-3
Correct answer is D
2x−1x+3 not defined
x + 3 = 0
x = -3
I am x years old and my brother is 3 years older. How old was my brother last year?
(x - 4)years
(x + 2) years
(3x - 10years
(3x + 1)years
Correct answer is B
I am x years old; My brother = 3 + x; My brother
last year = (3 + x) - 1 = x + 3 - 1
= (x + 2) years