Question

Given:
2x+3y=12
2x-y=4
What is the value of x + y?
Please explain!
Thanxs!!!

Answer 1

Weird question at first sight but here goes.
Subtract equation 2 from equation 1 giving 4y = 8
Here's why, 2x - 2x = 0, 3y - (-y) = 4y and 12 -4 = 8 hence 4y = 8
From this we get y = 2 by dividing both sides by 4.
Substitute the value of y ( 2 remember) into second equation to discover value x.
2x - 2 = 4 which implies (by adding 2 to both sides) 2x = 6 and hence x = 3
Therefore the answer to x+ y is 2 +3 = 5