3 years ago

Given: y= 2x + 1 and - 4x + y = 9, solve the system by substitution

Mathematics

1 answer:

kicyunya [14]3 years ago

6 0

Answer:

x=-4 y=-7

Step-by-step explanation:

-4x+y=9 get y alone

add 4x both sides

y=4x+9

insert into y=2x+1

2x+1=4x+9

subtract 1 both sides

2x=4x+8

subtract 4x both sides

-2x=8

divide by -2

x=-4

y=2x+1

y=2(-4)+1

y=-8+1

y=-7

check

-4(-4)+(-7)=9

-16+(-7)=9

9=9

x=-4

y=-7

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