Question

Which ordered pair is the solution to y − x = 3 and 2x + y = 9?

Answer 1

y-x=3
2x+y=9

so solving by multiplying first by 2
so we get , 2y-2x=6

adding both eqn now,

3y=15
y=5

so x=2

so y=5 and x=2 !!