Algebraic expressions by
Joab Otieno
6
What is an algebraic expression?
What is a variable?
workout
1/4w + 3 = 5
step 1
Subtract 3 from both sides
1/4w+3-3=5-3
1/4w=2
step 2
Multiply both sides by 4
4×1/4w=2×4
W=8
solve
3(x+2)=7
step 1
Remove the brackets ( ) by multiplying 3 by x and 3 by 2
3x+6=7
step 2
Subtract 6 from both sides
3x+6-6=7-6
3x=1
step 3
Divide both sides by 3
3/3x=1/3
X= 1/3
Exercise
Work out the following
1) 1/3x+8=11
2) 1/5m-3=9
3) 1/7k+8=14
4) 3(n+2n)=18
5) 5(3a+1) =35
Answer
1) x=9
2) m=60
3) k=42
4) n=2
5) a=2
