Question

What is the value of x in the equation 4x + 8y = 40, when y = 0.8?

4.6
8.4
10
12

Answer 1

4x + 8y = 40

4x + 8(0.8) = 40

What's 8 * 0.8?

Answer 2

6.4

Answer 3

Yes, so we have:

4x + 6.4 = 60

Now subtract 6.4 to both sides, what's 60 - 6.4?

Answer 4

53.6

Answer 5

^^^

Answer 6

Yes.

Answer 7

Now divide 53.6 / 4

Answer 8

Because we have:

4x = 53.6

Answer 9

yeah

Answer 10

i got 13.4

Answer 11

Yes, 13.4 is correct.