Question

The equation y = 38x + 50 models the data on a plumber's scatter plot, where x is the number of hours the plumber works, and y is the total bill in dollars. If Sal pays the plumber $126, how many hours did the plumber work?

1 hour
1.75 hours
2 hours
2.5 hours

Answer 1

The answer would be 2 hours,
y being the total ($126) so you would plug in 126 for y and solving the equation.

Answer 2

2 hours

Explanation:

I substituted y for 126 and solved like so:

126 = 38x + 50

126 - 38x = 50

(126-126) - 38x = 50 - 126

-38x = -76

-38x/-38 = -76/-38

X = 2

There ya go! Hope this helps, good luck :)