Question

3x+2y=21
y=x-2
do it with substitution method
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Answer 1

Answer:

answer is x=5

Step-by-step explanation:

first step given 3x+2y=21

second eq.

y=x-2

substituting y=x-2 in 3x+2y=21

3x+2(x-2)=21

3x+2x-4=21

5x=21+4

5x=25

x=5

Answer 2

Answer:

x=5,y=3

Step-by-step explanation:

y=x-2

3x +2y=21

3x+ 2(x-2) =21

3x+2x-4 =21

5x-4=21

5x=25

x=5

y =x-2

y= 5-2

y= 3