I presume you mean how many times will 70 divide by 2 to give a whole number. 70 will divide once by two to give a whole number.
However if you did not mean this then 70 will divide infinitely many times by 2 each time getting an answer closer to 0.
X must be increased by 6 to get its value to be 0. Then the corresponding change in y will be (-2/3)*6 = -4. That value added to -5 makes it -9.
The y-intercept will be -9.
N=4.5 In the picture are the steps you should follow to solve for n.
The answer is d) none because substituting -1/4x + 5/3 for y in the first equation gives 3x - 3x + 5/3 = 20 so 5/3 = 20 which is not true.