Changing the subject with more complex formula | Maths

Starter quiz

The subject of a formula is a variable expressed in terms of the other __________.
- equations
- values
- variables ✓
- variants
$x^2$ is not the subject of the equation $x^2=9-y^2$ . Why not?
- Because the coefficient is not $1$ .
- Because the exponent of $x$ is not $1$ . ✓
- Because $y^2$ is the subject.
- That's incorrect. $x^2$ is the subject of the equation.
Which of these are rearrangements of the equation $5e-7=2d$ ?
- $7-5e=2d$
- $5e-2d=7$ ✓
- $5e=7+2d$ ✓
- $2d+7=5e$ ✓
- $2d+5e=7$
Which two inverse operations should you perform to both sides to solve the equation $6x+7=49$ ?
- $-49$
- $+7$
- $-7$ ✓
- $\times 6$
- $\div 6$ ✓
Select the expressions that are equivalent to ${1\over3}(y-5)$ .
- ${1\over3}y-5$
- ${y\over3}-5$
- ${y\over3}-{5\over3}$ ✓
- ${{y-5}\over3}$ ✓
- $y-{5\over3}$
Match each expression to its description.
- $5d+2$
  
  ⇔
  
  $d \text{ }$ multiplied by $5$ then add $2$ ✓
- ${d\over5}+2$
  
  ⇔
  
  $d\text{ }$ divided by $5$ then add $2$ ✓
- ${{d+5}\over2}$
  
  ⇔
  
  $d\text{ }$ add $5$ then divided by $2$ ✓
- $2d+5$
  
  ⇔
  
  $d\text{ }$ multiplied by $2$ then add $5$ ✓
- $5(d+2)$
  
  ⇔
  
  $d\text{ }$ add $2$ then multiplied by $5$ ✓
- ${1\over5}(d+2)$
  
  ⇔
  
  $d\text{ }$ add $2$ then divided by $5$ ✓