Question

Kristen each solved the equation -3w + 7 = 1. Their teacher tells them that they both made a mistake!

Answer 1

w=2

Explanation:

The mistake on the first problem is that -6 / -3 does not equal negative 2, it equals positive 2.

The mistake on the second problem is that 1 - 7 does not equal 8, it equals -6

Answer 2

Explanation:

the first persons mistake:

-6/-3 isn't -2 it's 2 so they divided wrong

the second persons mistake:

they added 7 instead of taking it away which is why they got 8 instead of -6

how to work it out:

-3w+7=1

first take away 7 from both sides

-3w=-6

then divide each side by -3 to get w by itself

w=2