3x+2y=4 4x+5y=17 What is the value of x and y?
2 answers:
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Answer:
the ratio for this blueprint is 1:20
Step-by-step explanation:
The scale on a blueprint indicates that ½ " equals 10 feet
The ratio is in the form of a:b
Here from the given information
the value of 'a' is 1/2 and the value of b is 10
so the ratio a:b becomes
Multiply both sides of the ratio by 2 to remove fraction
so the ratio for this blueprint is 1:20
You solve for x
start by expanding the (3x-7)²
12 = 2(3x - 7)(3x - 7) + 4
12 = 2(9x² - 42x + 49) + 4
multiply the 2 through
12 = 18x² - 84x + 98 + 4
combine all like terms, set equal to zero
18x² - 84x + 102 - 12 = 0
18x² - 84x + 90 = 0
use the quadratic equation
Where
a = 18
b = -84
c = 90
then x = 3 and 5/3
start by expanding the (3x-7)²
12 = 2(3x - 7)(3x - 7) + 4
12 = 2(9x² - 42x + 49) + 4
multiply the 2 through
12 = 18x² - 84x + 98 + 4
combine all like terms, set equal to zero
18x² - 84x + 102 - 12 = 0
18x² - 84x + 90 = 0
use the quadratic equation
Where
a = 18
b = -84
c = 90
then x = 3 and 5/3