Question 1

$2x+y=4$, make $y$ the subject. This means rearrange the equation so $y = ?$

Accepted Answer

$y=-2x+4$

Answer

$y=4+2x$

Answer

$y=2x+4$

Answer

$y=2x$

Question 2

$2x+y=4$, make $x$ the subject. This means rearrange the equation so $x = ?$

Accepted Answer

$x=\frac{-y+4}{2}$

Answer

$x=-y+2$

Answer

$x=\frac{-y}{2}+4$

Answer

$x=\frac{y+4}{2}$

Question 3

$C = DP - 8$, make $D$ the subject. This means rearrange the equation so $D = ?$

Accepted Answer

$D=\frac{C+8}{P}$

Answer

$D=\frac{C-8}{P}$

Answer

$D=\frac{C}{P}+8$

Answer

$D=\frac{C}{P-8}$

Question 4

$7x-2y=14$, make $x$ the subject.

Accepted Answer

$x=\frac{2y}{7}+2$

Answer

none of these

Answer

$x=2y+2$

Answer

$x=\frac{y}{7}+2$

Question 5

$7x-2y=14$, make $y$ the subject.

Accepted Answer

$y=\frac{7x}{2}-7$

Answer

$y=\frac{7x-7}{2}$

Answer

$y=\frac{7x}{2}+7$

Answer

$y=\frac{7x+7}{2}$

Question 6

$a-by=c$, make $a$ the subject.

Accepted Answer

$a=by+c$

Answer

none of these

Answer

$a=by-c$

Answer

$a=c-by$

Question 7

$a-by=c$, make $b$ the subject.

Accepted Answer

$b=\frac{a-c}{y}$

Answer

$b=\frac{a}{y}-c$

Answer

$b=a-\frac{c}{y}$

Answer

$b=\frac{a+c}{y}$

Question 8

$a+by=c$, make $y$ the subject.

Accepted Answer

$y=\frac{c-a}{b}$

Answer

$y=a-\frac{c}{b}$

Answer

$y=\frac{a-c}{b}$

Answer

$y=\frac{c}{b}-a$

Question 9

Make $x$the subject:$\frac{4}{x}=8$

Accepted Answer

$x=\frac{1}{2}$

Answer

$x=16$

Answer

$x=4$

Answer

$x=2$

Question 10

Make $x$the subject:$\frac{x}{b}=c$

Accepted Answer

$x=bc$

Answer

$x=\frac{c}{b}$

Answer

$x=c^{b}$

Answer

$x=c-b$

Question 11

Make $x$the subject:$\frac{m}{x}=\frac{d}{c}$

Accepted Answer

$x=\frac{mc}{d}$

Answer

$x=mc-d$

Answer

$x=\frac{d}{mc}$

Answer

$x=\frac{m}{d}-c$

Question 12

Make $r$the subject:$I=\frac{Crn}{100}$

Accepted Answer

$r=\frac{100I}{Cn}$

Answer

$r=\frac{100}{Cn}$

Answer

$r=\frac{100I}{n}-C$

Answer

$r=\frac{100I}{C}-n$

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