Question

Which equation can be used to find the value of a?

A.

a – 42 = 91








B.

42 + a = 91








C.

91 + a = 42








D.

a – 91 = 42

Answer 1

they all can be applied.

Answer 2

They can all be used.

A. a – 42 = 91
+42 +42
--------------
a= 133

B. 42 + a = 91
-42 -42
____________
a= 49

C. 91 + a = 42
-91 -91
-----------------
a= - 49

D. a – 91 = 42
+91 +91
---------------
a= 133