Answer:
Question 1
X=0,y=0
Question 2
x=1,y=6
Step-by-step explanation:
The first question says we should solve by using substitution
y=3x...(1)
X+12y=3x...(2)
Let's substitute (1) into (2)
X+12(3x)=3x
X+36x=3x
Let's collect like terms
X+36x-3x=0
34x=0
Divide both sides by 34
X=0
Let's substitute the value of x in (1)
y=3(0)
y=0
Therefore x=0,y=0
The other question is elimination
2x+3y=20...(1)
-2x+y=4...(2)
Add (1) and (2)
4y=24
Let's make y the subject of formula by dividing both sides by 4
y=6
Substitute the value of y into(2)
-2x+6=4
Collect like terms
-2x=4-6
-2x=-2
Divide both sides by 2
x=1
Therefore x=1,y=6
