Simon has £100 and 3700 rand. He goes to a shop where he can spend both pounds and rand.
He wants to buy
a computer costing £360
or
a watch costing £400
or
a camera costing £375
Which of these items can Simon afford to buy?
You must show clearly how you get your answer

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1

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

m∠a is 90°

m∠b is 40°