Question

Which is the best estimate of x based on rounding the constants and coefficients in the equation to the nearest integer?

6.2x + 1.2 = 8.9

A.
1.3

B.
1.4

C.
1.6

D.
1.7

Answer 1

Do you know how to solve an equation algebraically? Subtract the 1.2 to the other side, so you get 6.2x = 9.7. Divide each side by 6.2 and round.

Answer 2

Oh, my bad - round the numbers first (0-4, number before the decimal, 5-9, number above before decimal. So, 6.2 = 6, and 8.9 = 10, etc.).

Answer 3

But then use the same solving process.

Answer 4

8.9 = 9

Answer 5

"Which is the best ESTIMATE of x BASED on rounding the constants and coefficients in the equation to the nearest integer?"

6.2x + 1.2 = 8.9
becomes
6x + 1 = 9
isolate x term
6x = 9-1
isolate x
x = 8/6

Answer 6

6x + 1 = 9
6x = 8
x = 8/6 rounds to 4/3 = 1 1/3 or 1.3