Answer:
D i mean i guess you try to salve on a piece of paper
Step-by-step explanation:
y=3x+1, y= -3x+7
y=1,X=1
X+y=10,2x+2y=20
X=5, y=5
7^7
7x7x7x7x7x7x7= 823543
I don't know I'm sorry (◞‸◟ㆀ)