Grade 10 Mathematics - More Exercises.
Linear equations. : answers.
1.
3a + 7 = 28
2.
4b - 3 = 9
3a + 7 - 7 = 28 - 7 ... remove 7
4b - 3 + 3 = 9 + 3 ... remove 3
3a = 21
4b = 12
a = 7 ... divide by 3
b = 3 ... divide by 4
3.
c = 2
4.
x = − 5
5.
x = − 3
6.
x = 1
7.
y = − 1
8.
a = 2
9.
a = − 3
10.
7x + 12 = 2(3x - 7)
11.
3x = 8(x + 3) - 9
7x + 12 = 6x - 14 ... remove brackets
3x = 8x + 24 - 9 ... remove brackets
7x - 6x = - 14 - 12 ... gather like terms
3x - 8x = 24 - 9 ... gather like terms
x = − 26 ... simplify
x = − 3 ... simplify
12.
a = − 3
13.
b = 4
14.
c = 0,6
15.
m = 0,5