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Is this a system of equations?

its substitution method

x-4y=0
+4y +4y
x=4y
3(4y)+5y=0
12y+5y=0
17y=0
divide each side by 17
y=0

x=4y
x=4(0)
x=0

thank you

could you help me with more questions??

4k+m=9
3k-4m=2

yep one sec

4k+m=9
-4k -4k
m=-4k+9
3k-4(-4k+9)=2
3k+16k-36=2
+36 +36
19k=38
divide each side by 19
k=2

4(2)+m=9
8+m=9
-8 -8
m=1

Do you understand what I did to get those answers or would you like me to explain?