Question

Cedric and Insha solved the same equation using the calculations below. Cedric and Insha solved the same equation using the calculations below. Cedric and Insha solved the same equation using the calculations below.

Answer 1

A is the answer on Edgen. Just took the test.

Explanation:

Cedric is correct because he used the inverse of subtraction and added 4.5.

Cedric is incorrect because he should have subtracted 4.5 from both sides instead of adding.

Insha is correct because she added the opposite if 4.5, which is Negative 4.5, to both sides.

Insha is incorrect because she did not add Negative 1.5 + (negative 4.5) correctly.

Answer 2

Cedric's Work :

z - 4.5 = -1.5

z - 4.5 + 4.5 = -1.5 + 4.5

z = 3

Insha's Work :

z - 4.5 = -1.5

z - 4.5 + (-4.5) = -1.5 + (-4.5)

z = -6

Which statement is true about their work?

Given options :

(a) Cedric is correct because he used the inverse of subtraction and added 4.5.

(b) Cedric is incorrect because he should have subtracted 4.5 from both sides instead of adding.

(c) Insha is correct because she added the opposite if 4.5, which is -4.5, to both sides.

(d) Insha is incorrect because she did not add -1.5 + (-4.5) correctly.

Answer : Option A

Insha work is incorrect because she forgot to perform opposite operation.

z - 4.5 = -1.5

Opposite of -4.5 is +4.5

Insha subtracted 4.5 on both sides instead of adding it.

Cedric added 4.5 on both sides of the equation.

Cedric is correct because he used the inverse of subtraction and added 4.5.