Changing the subject
Make x the subject
4x + y = z
What is:
x = (z - y)/4
Solving Equations
4x + 3 = 7
What is:
x = 1
A bag has some marbles in it. 7 marbles are added. Now there are 12 marbles in the bag. How many were there at the start?
5 marbles
Simplify the expression:
b + 8 - 9b +1
What is:
9 - 8b or -8b + 9
Solving Inqualities
3 + 10c < -37
What is:
c < -4
Make x the subject
3x/y = y
What is:
x = y2/3
Solving Equations
254 = -2v - 6(2 +6v)
What is:
v = -7
Juan is x years old. Ana is 5 years older than Juan. The sum of their ages is 43. How old is Ana?
24
Simplify:
-4(2 - 6b)
What is:
24b - 8 or -8 + 24b
Solving Inqualities
4(k + 1)> -68
What is:
k > -18
Make x the subject
xy + xz = 4
What is:
x = 4/(y + z)
Solving Equations
3(2x-3)+4(x-4)=23+4x
x=8
A bookstore sells books for $15 each, and they have sold X books so far. If their total revenue is $600, how many books have they sold?
40 books
Simplify:
8x - 9(8 - 2x)
What is:
26x - 72
Solving Inqualities
-8(6 +x)<16
What is:
x > -8
Make x the subject
3xy = 4xz + 1
What is:
x = 1/(3y - 4z)
Solving Equations
-5(8n - 4) - n = - 16 - 5n
What is:
n = 1
A rectangle's length is 3 times its width, and its perimeter is 40 meters. What is the length of the rectangle?
15 meters
Simplify:
8(x - 6) - 5(-6 - 2x)
What is:
18x - 18
Solving Inqualities
53 < 8n + 5 < -43
What is:
6 < n < -6
Make x the subject
5x - 3xy = 4x + xz + w
What is:
x = w/(1 - 3y - z)
Solving Equations
7(x+1)=3(2x-5) - (5-x)
No Solution
Sarah has $1200 saved, and she's saving $50 per month. How many months will it take for her to have $2500 saved?
26 months
Simplify
3(x+7)+8x-4-(x+1)+(x+3)(x-3)
x2+10x+7
Solving Inqualities
-24 -2x < 14x + 8 < 152 - 2x
What is:
-2 < x < 9