Answer:
18
Step-by-step explanation:
90-80=10
10*2=20
20-2=18
The solution is where the two lines meet. From the the graph, it looks like
(1, -1)
Answer: He went wrong when multiplying.
Step-by-step explanation: He went wrong when multiplying because if you actually do the problem your answer would be 8 but he probably did 8 times 10.
(B) y= -3x + 8 because if you plot the point at (5,-7) and start doing the slope of three, you get to 8 on the y axis