Question

The money m (in £) Billy has to spend each week is his wage w (in £) subtract the tax t

Answer 1

Answer:

$Formula : \to \: \boxed{m = w - t} \\ he \: can \: spend : \to \boxed{£108}$

Step-by-step explanation:

$let \: the \: money \: (in \: £) \: Billy \: has \: to \: spend \: be \: \to \: \boxed{m} \\ let \: his \: wage \: (in \: £) \: be \to \: \boxed{w} \\ let \: the \: tax \: (in \: £) \: be \: \to \boxed{t} \\ then \: the \: required \: formula\: \: is \to \\ \boxed{m =w - t } \\ if \: he \: earns \: £150 \: and \: pays \: £42 \: tax \: : \: then \: \to \\ m = £150 - £42 \\ m = £108$

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