A restaurant sells basic lunches for $6 and supreme lunches for $8. You buy 12 lunches, represented
by the equation x + y = 12, where x is the number of basic lunches and y is the number of supreme
lunches. The equation 6x + 8y = 88 represents the total cost. How many of each type of lunch did you
buy?

you can't solve x because it is 2 linear equation and you only have one equation

step-by-step explanation:

we have

using a graphing tool

see the attached figure

this is a quadratic equation (vertical parabola) open up

the vertex is a > vertex

the domain of the function is all real > interval (-∞,∞)

the range of the function is the > [-6.125,∞)

the function has two x->   and

the function is increasing over the > (0.25,∞)

the function is decreasing over the > (-∞,0.25)