50cm = 0.5 meters ,so he will need 32 sections
64%, because 40% of 60% is 24%, and 2 mg of pure copper is 40% of the overall alloy, so add 24 and 40
You can find the y-intercept by plugging in zero for x and solving. We know that the value will always be zero when the point is on the y-axis, which is the y-intercept.
3(0) -4y = 16
-4y = 16
divide both sides by -4
y = -4
Letter A
Answer: y = 10x + 30 is the correct answer
