Solve the system by substitution y = -4x -4 y = -8x

Mathematics

1 answer:

Fudgin [204]2 years ago

4 0

Answer:

x = 1

Step-by-step explanation:

Given :

y = -4x - 4
y = -8x

Equate the sides :

-4x - 4 = -8x

Add 4 on both sides :

-4x - 4 + 4 = -8x + 4
-4x = -8x + 4

Add 8x on both sides :

-4x + 8x = -8x + 4 + 8x
4x = 4

Divide both sides by 4 :

4x/4 = 4/4
x = 1

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So we have to make denominators' numbers the same in order to sum up them all (we can sum fractions if the denominators are the same) , and we did it by cross product (that thing on the picture)

Equating by lcm (least common multiple) is the easiest way, because you might see bigger numbers on other questions, and cross product will bring much bigger numbers, so this technic might confuse you.

By the way lcm of 4 and 5 is already 20

Hope it helps!