Pls help with atleast one plsss, thank you so much :') Solve each system using SUBSTITUTION. Remember to check!

1)

y = –2x – 1

y = 3x – 16

2)

y + 6 = 2x

4x – 10y = 4

my answer for #1 is: x=3 y = -7 is this correct? pls correct me

Jonathan pays $1.90 per pound for potatoes. he buys 8.3 pounds of potatoes. he determines that he will pay $15.77, before tax, for the potatoes. which best describes the reasonableness of jonathan’s solution? jonathan’s answer is reasonable because there are two decimal places in the factors and two in the product. jonathan’s answer is unreasonable because there are three decimal places in the factors and two in the product. jonathan’s answer is reasonable because is 16, and 16 is close to 15.77. jonathan’s answer is unreasonable because is 8, and 8 is not very close to 15.77.

Find the pattern and use it to list the nth term in the sequence. 6, 12, 20, 30, 42, 56, the nth term of the sequence is

When you answer this can you explain