Aprinter will produce 80 wedding invitations for $210. the price to produce 120 invitations is $290. the printer uses a linear function to determine the price for producing different amounts of invitations. how much will the printer charger to produce 60 invitations!

The answer is 190 dollars  

In order to solve this equation, you'd first find the difference between the two costs then you'd register that that is the cost per forty invitations so you'd subtract that amount from two hundred ten twice and see that there is a remainder of fifty. That is because that's the base printing cost, then you get charged two dollars per invitation. for sixty invitations you'd pay one hundred twenty dollars on top of the up front fee of fifty dollars. So, the cost for 60 invitations is $170.
y=2x+50    y=170    x=2
x is the number of invitations and is also the indirect variable
y is the total cost for the production of the invitations and id the direct variable because it varies directly with x