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3 years ago

5) x - 4y = 28 -4x - y = 7 Solve each system by elimination

Mathematics

2 answers:

Novay_Z [31]3 years ago

8 0

Answer:

(0,-7)

Step-by-step explanation:

x-4y=28 multiply by 4

-4x-y=7 multiply by 1

4x-16y=112

-4x-y=7

cross out the x and add the rest

-17y= 119

divide by -17

y= -7

now you substitute the y in one of the equations.

the reformed equations

we will use the second one

-4x-(-7)=7

two negative becomes a plus

-4x+7=7

now you minus the 7 to both sides

-4x=0

now divide by -4

x=0

(0,-7)

dexar [7]3 years ago

3 0

Answer:

x = 0, y = -7

Step-by-step explanation:

x - 4y = 28

-4x - y = 7

____________

x - 4y = 28

-16x - 4y = 28

____________ _

17x = 0

x = 0

0 - 4y = 28

y = -7

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