Gary saving for a trip he wants to at least have $77 for each of the 13 days of his trip if he saves $87 each month for 10 month
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If the equation is passing trough the origin, it will be passing trough the point (0,0). We now for our problem that the equations is also passing trough the point (-4,3). So, our line is passing trough the points (0,0) and (-4,3). To write the equation in slope-intercept form, first, we need to find its slope 
. To do that we are going to use the slope formula: 
.
From our two points we can infer that
, 
, 
, 
. Lets replace those values in the slope formula:
Now that we have our slope, we can use the slope-intercept formula:
We can conclude that the equation of the line passing trough the points (0,0) and (-4,3) is.
From our two points we can infer that
Now that we have our slope, we can use the slope-intercept formula:
We can conclude that the equation of the line passing trough the points (0,0) and (-4,3) is