
Substitute x = 2 into y = - 6x + 9

Answer : x = 2, y = - 3
Hope this helps. - M
Answer:
Step-by-step explanation:
h and p are the number of history and psych textbooks, respectively.
store sold a total of 411 textbooks in a week.
h + p = 411
The number of history textbooks sold was 69 less than the number of psychology textbooks sold.
h = p - 69
Substitution
(p-69) + p = 411
2p = 411+69
p = 240
h = p-69 = 171
171 history books and 250 psych books
The y intercepts are 9 and -9 because the y coordinate is zero so they would be plotted ob the y axis and 7 is an x intercept because the x coordinate in the ordered pair is zero.
14÷3= 4.6666666...
so 4 cookies for each one... with 2 cookies left