Can someone help me with this question , please?

Ellen makes and sells bookmarks. she graphs the number of bookmarks sold compared to the total money earned. why is the rate of change for the function graphed to the left?

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.

This summer the number of tourists in salem increased 4.5% from last years total of 426000. how many more tourists came to salem this summer