The equations were multiplied by constants and added together to determine that the value of x in the system of equations is –20
. One-fifth x minus one-third y = negative 1 Negative three-fourths x + one-third y = 12 What is the value of y? –15 –9 9 15
1 answer:
Answer:
Step-by-step explanation:
Given:
1. 1/5x - 1/3y = -1
2. -3/4x +1/3y = 12
Multiplying equation 1 by 15 and equation 2 by 12
3. 3x - 5y = -15
4. -9x + 4y = 144
and then Solving both equations simultaneously, since x = -20 as stated in the question and by confirmation,
Using equation 3 or 4 to solve for y,
3(-20) - 5y = -15
-5y = 60 - 15
y = 45/-5
= -9
y = -9
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