They spent 5839 on electrical appliances and 6659 on furniture
1:24 and 2:20 and 3:30 and 4:16 and 5:12
Slope intercept form:
y = mx + b
Where m = slope and b = y-intercept.
By looking at the graph, we can see that the line cuts at 1/2 on the y-axis, therefore eliminating option D.
So now we have:
y = mx + 1/2Next, we'll find the slope.
![\frac{y_2-y_1}{x_2-x_1}](https://tex.z-dn.net/?f=%20%5Cfrac%7By_2-y_1%7D%7Bx_2-x_1%7D%20)
Plug the coordinates into the formula.
![\frac{3-(-2)}{4-(-4)}= \frac{5}{8}](https://tex.z-dn.net/?f=%20%5Cfrac%7B3-%28-2%29%7D%7B4-%28-4%29%7D%3D%20%5Cfrac%7B5%7D%7B8%7D%20%20)
So our slope is 5/8 and the y-intercept is 1/2.
Option A is the answer.
So it would be 10-2x . X would be the months and it would be -2 because she uses that much per month