Question

Substitute x = 5 into the expression (-2)x + 6. Do you get -4? Substitute x = -1 into the expression (-2)x + 6. Do you get - 4 Which method gives the correct answer ?

Answer 1

Answer:The first method, by substituting 5 into the expression (-2)x + 6 gives the coreect answer of -4

Explanation:

Ist method

Substituting x = 5 into the expression (-2)x + 6, we have

(-2) 5 + 6,

=-10 + 6

=-4

2nd method

Substitute x = -1 into the expression (-2)x + 6,we have

(-2)(-1) + 6

2 +6=10

The first method, by substituting 5 into the expression (-2)x + 6 gives the coreect answer of -4