$\therefore \: y = kx..(1) \\ (k = constant \: of \: proportionality) \\ at \: y = 21 \: and \: x = 7 \\ 21 = k \times 7 \\ k = \frac{21}{7} = 3 \\ plugging \: k = 3 \: in \: equation \: (1) \\ y = 3x..(2) \\ plugging \: \: y = - 5 \: in \: (2)\\ - 5 = 3x \\ x = \frac{ - 5}{3} \\ \: \: \: \: \: \: \huge \red{ \boxed{x = - \frac{5}{3} }}$

6 0

2 years ago

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Everyone friend me Plz! Why not?<br> Btw What is 3{(x-5)+4}-8=31?

Lesechka [4]

Think about it think 6x5 or higher then you will get you answer by doing that

6 0

3 years ago

A restaurant listed its prices for a medium pizza based on the number of toppings in the table below

sammy [17]

One topping is 6.90 dollars

6 0

2 years ago