Can someone i try it hard but i don’t understand it

The answer would be 35!

The reason that this would be the answer is because of all the given answers only two of them are a multiple of 7, which are 79 and 35.

Out of both of these possibilities only one of them is lower than 45, which is 35. That’s how you get the answer! :)

He could have scored 7, 14, 21, 28, 35, or 42 points (all multiples of 7 less than 45).

B

Ok so the equations are
4(x-2)=19-5y 
3(x-2)-2y=-y
So just solve for one variable on one equation 
4x-8=19-5y
Which will get you y=-4x/5 +27/5
Then just substitute x in on the other equation, so
3(x-2) - 2 (-4x/5+27/5) = 4x/5 - 27/5
And then just solve, so you would get
x=3, and plug this into another equation, and get also y=3.