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3 years ago

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

Mathematics

2 answers:

lutik1710 [3]3 years ago

6 0

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

Lina20 [59]3 years ago

4 0

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

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