YOUR ANSWER IS : C : (2, 1)
You basically have to put the points inside the equations given. 1 is the y-intercept, it goes in place of y. 2 is the x-intercept, it goes in place of x. So let's try it out:
y = x - 1
1 = 2 - 1
1 = 1
y = -2x + 5
1 = -2(2) + 5
1 = -4 + 5
1 = 1