We have that
<span>x - y = 4-------> multiply by -1-----> -x+y=-4-----> equation 1
x+ 2y = 4------> equation 2
add equation 1 and equation 2
-x+y=-4
x+2y=4
-----------------
0+3y=0-----> y=0
x+2y=4------> x+0=4------>x=4
the solution is the point (4,0)</span>
Answer:
(B)All right angles are congruent
Step-by-step explanation:
Given that:

The reason for this congruency is that both are right angles and in fact, all right angles are congruent.
Answer:
Option 2
x + 90 + 61 = 180
Step-by-step explanation:
x + 90 + 61 = 180
Supplementary angles
1x+5 ....................