Question

substitution. what is the value of y if x = 4?
y = 5x + 12

y = \\(\frac{3}{2}\\)x - 10

Explanation:

Step1: Substitute $x=4$ into first equation

$y = 5(4) + 12$

Step2: Calculate first $y$ value

$y = 20 + 12 = 32$

Step3: Substitute $x=4$ into second equation

$y = \frac{3}{2}(4) - 10$

Step4: Calculate second $y$ value

$y = 6 - 10 = -4$

Answer:

For $y=5x+12$, $y=32$; for $y=\frac{3}{2}x-10$, $y=-4$