Page 69 - Math Smart - 7

Check My

Understanding

O For each equation, does the solution given in the bracket make the equation true?
Answer Yes or No.
a) y - 3 = 4 (y = 8) b) 6x = 18 {x = 3) c) 1=8 (/"^IS)

-4
f)
X
d) 3a: + 2 = 8 (a: = 2) e) j-2 = 5 (a: = 9) |= 1 (d = 25)
O Choose the correct solution to each equation,
a) 3x - 36
i) a: = 6 ii) a: = 12 iii) a: = 33 iv) x = 11 v) x = 13
4
b) f =
8
i) a: = 3 ii) X = 6 iii) X = 1 Iv) X = 0 v) X =
7
c) 6x - 5 =
3
1
S
1) X = ii) X = iii) X = 2 iv) X = 6 v) x =
d) f + 6 = 8
i) X = 5 11) X = 1 iii) X = 9 iv) x = 6 v) x = 12

O Challenge! Find the value of x for each equation.
9
2x+ 1 b) ^ + 6 = c) iM.3
1
a) = 3 d) -7 =
J

Solving simple equations

Think of the balance as an equation. It represents the equation x + 2 = 5. To find
the value of x, you need to find a way to leave x on its own.

. 6)nn.

If we take away 2 from both sides of the balance, we are left with x = 3.
We need to keep the scale
x + 2 = 5 balanced when adding,
x + 2 — 2 = 5 — 2 Subtract 2 from both sides of the equation. subtracting, multiplying
or dividing terms in the
X = 3
equation.
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