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If 3x+20=2y and x+5=y show that (2,7) is a solution solve by substitution. PLEASE ANSWER ME
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5 votes
If 3x+20=2y and x+5=y show that (2,7) is a solution solve by substitution. PLEASE ANSWER ME

User Ed Sullivan
by
7.8k points

2 Answers

4 votes
subsitute x+5 for y
3x+20=2(x+5)
3x+20=2x+10
minus 2x both sides
x+20=10
minus 20
x=-10
sub back

x+5=y
-10+5=y
-5=y


x=-10
y=-5
(x,y)
(-10,-5)


(2,7) is not a solution
User Ed Schwehm
by
9.1k points
2 votes
well, 2 is x and 7 is y correct? so you would just do it like this

3x+20=2y
x+5=y

3(2)+20=2(7)
2+5=7
User Voonic
by
8.3k points
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