A knife is 3 times the cost of a spoon. 9 spoons and 12 knives cost £82.80
work out the cost of 1 knife using simultaneous equations

£5.52

Step-by-step explanation:

K = 3S

9S + 12K = 82.80

9S + 12 (3S) = 45S = 82.80

S = 1.84

K = 3 x 1.84 = 5.52

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c

answer: i literally just answered this question but they want me to do it again

step-by-step explanation: