Answer:
C. x + 2y = 10
-4x - y = 2
Step-by-step explanation:
A. quickest way is to plug in -2, 6 and see which one works
B. this is the other way
1. x + 2y = 10
-4x - y = 2
2. multiply 4 with x + 2y = 10 so i can get 4x + 8y = 40
i want +4x so i can cancel with the -4x in -4x - y = 2
3.
4x + 8y = 40
-4x - y = 2
--------------------
7y = 42
y = 6
4. then plug in 6 into an equation to get x
-4x - y = 2
-4x -6 = 2
-4x = 8
x = -2
Answer:
y=20
Step-by-step explanation:
5y = 100
Divide both sides by 5 (we can do this because of the division property of equality):
y=20
BD = BD ---------> reflexive property
Triangle ADB = triangle CDB ---------> SAS congruence postulate
Hope that helps.
24-3x=2x-1
+3x. +3x
24=5x-1
+1. +1
25=5x
X=5