Can someone help me on these two questions please for 86 points and i'll award someone the brainiest
2 answers:
Answer:
1) x = 1, y = 5
2) x = -7 , y = 21
Step-by-step explanation:
1) 5x + 2y = 13
x + 2y = 9
5x + 2y - 13 = x + 2y - 9
combine like terms:
5x - x + 2y - 2y - 13 + 9 = 0
4x - 4 = 0
x = 4 / 4
x = 1 ----------plug in x=1 on equation x + 2y = 9
1 + 2y = 9
y = 10 / 2
y = 5
therefore x = 1, y = 5
-----------------------------------------
2) 2x + y = 7
5x - y = 14
combine like terms:
2x + y -7 - 5x - y - 14 = 0
-3x - 21 = 0
x = 21/-3
x = -7 ----------plug in x=-7 on equation 2x + y = 7
2(-7) + y = 7
-14 + y = 7
y = 7 + 14
y = 21
therefore x = -7 , y = 21
5x + 2y = 13 x + 2y = 9 Subtract :- ( note that 2y - 2y = 0):- 4x + 0 = 4 x = 1 From 2nd equation plug in x = 1 1 + 2y = 9 2y = 8 y = 4 Solution to this equation is x=1,y=4 2x + y = 7 5x - y = 14 Adding eliminates the y terms because y + -y = 0 :- 7x + 0 = 21 7x = 21 x = 3 Plug x=3 into second equation:- 5(3) - y = 14 y = 15-14 = 1 solution is x =3, y = 1
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