┏┓┏┳━━┳┓┏┓┏━━┓ ┃┗┛┃━━┫┃┃┃┃ ╭╮ ┃ ┃┏┓┃━━┫┃┫┗┫ ╰╯ ┃ ┗┛┗┻━━┻━┻━┻━━┛
We are given with two equations to find the values of two variables, hence the problem can be solved.
Adding the two equations:
x + y = 12<u>x - y = 10
</u>2x = 22
<u />x =11
y = 1
R = dt
/d /d
R/d = t
I think again