Her first order consists of two types of tacos. The deluxe taco costs $2.95 and the vegetarian taco costs $2.25. She orders a total of 50 tacos. The total price before tax is $137. How many of each taco did Kenya order?

  x + y = -6

Step-by-step explanation:

The equation of the first street is x+y = 1. The equation of the second street will have the same form, but with a different constant. Since the constant is the sum of the x and y coordinate values, it is easily found to be -5-1 = -6. Then the equation is ...

  x + y = -6

The first street is seen from the graph to have a slope of -1 (1 unit down for each 1 unit to the right). Since the y-intercept is +1, the slope-intercept form of its equation is ...

  y = -x + 1

In standard form, this is ...

  x + y = 1

A parallel line will have the same expression on the left with a different constant on the right.