If 3x+20=2y and x+5=y show that (2,7) is a solution solve by substitution. PLEASE ANSWER ME
2 answers:
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
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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The answer is 3 :) hope helps
Answer:
<em>it's either A or B hope I helped a little</em>
Your answer would be D.) 5
