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What is the value of y in the solution to the system of equations 5x-y=25 and x+4y=-10

2 Answers

3 votes

Answer:

x+4y =10

5x-y =25

Explanation:

x=10-4y

5(10-4y)-y =25

50-20y-y =25

50-21y = 25

-21y = 25-50

-21y =-25

y =25/21

Substitute y =25/21 in equation 1

x + 4(25/21) = 10

x +100/84 =10

x=10-100/84

User Azusa
by
7.0k points
5 votes

Answer:

y=-3.571

Explanation:

To get rid of the x's make the other x cancel out the other.

5x-y=25+(-5(x+4y=-10)=-21y=75= -3.571

User Nhu Trinh
by
6.8k points