3x + y = 19 , and x + 3y = 1. Find the value of 2x + 2y Can anyone explain this one for me?
2 answers:
The value of 2x + 2y = 10
<h3>Further Explanation </h3>One variable linear equation is an equation that has a variable and the exponent number is one.
Can be stated in the form:
or
ax + b = c, where a, b, and c are constants, x is a variable
Whereas the two-variable linear equation is a linear equation that has 2 variables and the exponent is one
Can be stated in the form:
x, y = variable
3x + y = 19, and x + 3y = 1
The two equations above are equation 2 variables
Can be solved by elimination and substitution
- 1. Elimination
3x + y = 19 x1 ---> 3x + y = 19
x + 3y = 1 x3 ----> 3x + 9y = 3
---------------- -
-8y = 16
y = -2
- 2. Substitution
x + 3 (-2) = 1
x -6 = 1
x = 7
We input both x and y values to solve the equation:
2x + 2y
2 (7) +2 (-2)
= 14-4
= 10
<h3> Learn more </h3>
the slope-intercept form of the linear equation
a graph of a linear equation
system of linear equations
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Answer:
Option C
Step-by-step explanation:
Given that u-ai + bj and v-ci + dj are vectors
We have dot product
hence inner product of u and v. So option a is true
The dot product of u and v is a scalar is true because dot product is always a scalar
The dot product of u and v is a vector. is false because dot product is only a scalar and has no direction and hence cannot be a vector
The dot product of u and v is given by the expression ac+bd
True because we multiply corresponding i components and j components and add.
So only C is not true.