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4 years ago

Please help me with an addition formula problem!

1 answer:

6 0

2a + 3b = 6
5a + 2b = 4

We multiply the first equation by 5 and the second by 2 and and subtract the second from the first:

10a + 15b = 30
-10a -4b = -8

11b = 22
b = 2

2a + 3(2) = 6
2a = 0
a = 0

Checking,
5(0) + 2(2) = 4
4 = 4, true

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3 years ago

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2 years ago

Read 2 more answers

The graph represents the piecewise function:

Anna [14]

Answer:

in the attachment

Step-by-step explanation:

Given: Piece-wise function graph.

We need to find the function.

In the graph, we can see a two-piece

For -3≤x≤0

Endpoints on graph (-3,-6) and (0,0)

It is the horizontal line. The equation of the horizontal line is y=k.

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2 years ago

⦁ Scott works as a delivery person for a shipping company. The graph shows a linear model for his delivery times on different da

BARSIC [14]

Answer:

(3, 21), (6, 12)
-3
y -21 = -3(x -3) ⇒ y = -3x +30
30 minutes; 3 minutes

Step-by-step explanation:

a) The two marked points have coordinates (days, minutes) = (3, 21) and (6, 12).

b) The slope is the vertical change (rise) divided by the horizontal change (run). For these two points, that is ...

rise/run = (12-21)/(6-3) = -9/3 = -3 = slope

c) The point-slope form of the equation for a line is ...

y -k = m(x -h) . . . . . . for slope m through point (h, k)

Using the first point and the slope we found, this is ...

y -21 = -3(x -3) . . . . . point-slope form

Add 21 and eliminate parentheses:

y = -3x +9 +21

y = -3x +30 . . . . . . . . collect terms; slope-intercept form

d) The initial time is the time corresponding to day 0, the value of y when x=0. It is 30 minutes.

The slope in part (b) tells us the time decreases by 3 minutes per day.

6 0

3 years ago