3 years ago

How to solve 4y=x 3x- y=70 using substitution

1 answer:

7 0

X = 4y
3x - y = 70

substitute the x in the second equation with the other half of the first equation.

3(4y) - y = 70
12y - y = 70
11y = 70
y = 6.36 repeating, or 6 4/11

now use this to solve first equation
x = 4 (6 4/11)
x = 25.45 repeating

done

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Answer:

Step-by-step explanation:

The complete square starting with $x^2+14x$ would be $x^2+14x+49$ , since the square would be $(x+7)^2$ . To make this square perfect, then, you would need to add 46 to make 49 with the 3. Hope this helps!