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Math question?? 8th grade?
17. 4x-13=2y
12x+10y=15
Which is the solution to the system of equations
A (-19/2, -3/2)
B (3,-1/2)
C (5/2, -3/2)
D (5/2, 9/2)
(explain answer!! thx)
3 Answers
- 8 years agoFavorite Answer
5(4x-2y=13) = 20x-10y=65
12x+10y=15 12x+10y=15
32x=80
x=5/2
4(2.5)-13=2y
10-13 = 2y
2y = -3
y= -3/2
Answer = C
- KrishnamurthyLv 58 years ago
Which is the solution to the system of equations?
4x - 13 = 2y
12x + 10y = 15
12x - 6y = 39
16y = -24
y= -3/2
x = 5/2
Answer choice:
C (5/2, -3/2)
- Anonymous8 years ago
You have two systems of equations and two variables.
In the first, solve for y, this yields y=(4x-13)/2
Plug this into the second equation and solve for x
12x+10[(4x-13)/2]=15
Solving for x yields x=80/32=5/2
Plug this back into your solution for y and you get y=-3/2
Your answer is c
