2) In a certain school, the pupils have to study Mathematics, Science or Geography. Each pupil must study at least one of the three subjects. Among a group of 40 pupils, 20 are studying Mathematics, 22 Science and 28 Geography; 12 are studying Mathematics and Science, 14 are studying Science and Geography and 15 are studying Mathematics and Geography. How many pupils are studying all the three subjects?

idk but i need points bru

Step-by-step explanation:

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

b: y = 2x + 2

step-by-step explanation:

y = 2x + 1

we want a line that is parallel, so it will have the same slope

the line is in the form y= mx+b, so the slope is 2

we have a slope and the y intercept (0,2)

since x is 0 we know the y point which is the y intercept

we can use y= mx+b to write the equation of the line

m is the slope and b is the y intercept

y = 2x +2