Question

4 multiple choice 4 points if x = -3, then $12 - 2(x + 1) =$? 19 4 7 20 16 5 multiple choice 4 points if $2x - y = 6$, and $x + 4y = 12$, what is the value of y? 2 3 0 1 -6

Explanation:

Step1: Substitute $x=-3$ into the expression

$12 - 2(-3 + 1)$

Step2: Calculate inside the parentheses

$-3 + 1 = -2$

Step3: Multiply the result by 2

$2\times(-2) = -4$

Step4: Compute final value for Q4

$12 - (-4) = 12 + 4 = 16$

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Step1: Isolate $x$ from second equation

From $x + 4y = 12$, we get $x = 12 - 4y$

Step2: Substitute $x$ into first equation

$2(12 - 4y) - y = 6$

Step3: Expand and simplify the equation

$24 - 8y - y = 6$
$24 - 9y = 6$

Step4: Solve for $y$

$-9y = 6 - 24$
$-9y = -18$
$y = \frac{-18}{-9} = 2$

Answer:

Question 4: 16
Question 5: 2