find two solution of the equation 4x-5y=15. also check wheather(2,-2) is a solution or not. answer plz. or i make brainly.
Answers
Answer:
Two solutions are (5,1) , (10,5)
and (2,-2) is not a solution of the given equation.
Step-by-step explanation:
Given 4x-5y=15
so 4x=15+5y
hence x=(5y+15)/4
for y=1
x=(5+15)/4=20/4=5
and for y=5
x=(25+15)/4=40/4=10
hence two solutions are (5,1) and (10,5)
lets substitute
y= -2
x=(-10+15)/4=5/4 which is not equal to 2
Hence (2,-2) is not a solution of the given equation.
proved
Answer:
I found three solutions of the equation 4x-5y =15 are (5,1), (10,5), (20,13). Solution set (2, -2) is not solution of the equation.
Step-by-step explanation:
I employed the listing method of the possible values of 4x and subtracted it for possible values of 5y that could give me a result of 15.
20 -5 =15 in equation form, 4(5) -5(1) =15. Thus (5, 1)
40-25 = 15 in equation form, 4(10)-5(5) = 15. Thus (10,5)
80-65 = 15 in equation form, 4(20) - 5(13) =15. Thus (20,13)
To check (2, -2) substitute its value to the equation, 4(2) -5(-2) = 15
8+10 = 15
18 ≠15