Find a so that the point (-1,1) is on the graph of f(x)=ax2 +2

What are the solutions of the following system? y=-2x^2 y=x-2

With this question, the answer with the red arrow is incorrect!

At the beginning of the year, adrian's savings account balance was \$28$28. each week, he deposits another \$15$15 into that account, and he doesn't spend any of his savings. is his savings account balance proportional to the number of weeks since the start of the year?