3 years ago

What is the answer to y=6+4x and y=-5x-21

2 answers:

4 0

Y=4x+6
y=-5x-21

4x+6=-5x-21
add both sides by 5x
also subtract both sides by 6
9x=-27
x=-3

plu x=-3 in y=6+4x
y=6-12
y=-6

lina2011 [118]3 years ago

4 0

y=6+4x

y=-5x-21

=> 6+4x=-5x-21

9x=-27

x=-3

y=6+4*(-3)=6-12=-6

y=-6

Solution: (-3; -6)

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