Question

I do not understand theses... Please help!

Answer 1

Y = x + 1
y = 2x - 1

basically we r going to sub in one y for another
x + 1 = 2x - 1
1 + 1 = 2x - x
2 = x

now we sub 2 in for x in either of the original equations to find y
y = x + 1
y = 2 + 1
y = 3

so ur solution is (2,3)

Answer 2

Y =x+1
y=2x-1
-------------subtract
0 = -x +2

-x + 2 = 0
x =2

y =x+1
y =2+1
y= 3

answer 
solution (2,3)