Answer:
x=-2, y=-6
Step-by-step explanation:
Simple substitution.
Since y is isolated in one of the equations already, you can plug it into the second equation.
x - 2(3x) = 10
x - 6x = 10
-5x = 10
x = -2
Sub. x = -2 into 3x = y:
3(-2) = y
y = -6
f(-10) = 4
f(-2) = 4
Since y is constant while x isnt we just dont need to put x
f(x) = 4
The value of y when the value of x is 8 is 87
<h3>Function and values</h3>
Functions are equation expressed in terms of variables. Given the expression below;
y = 10x + 7
If the value of x is 8, then on substituting, we will have:
y = 10(8) + 7
y = 80 + 7
Simplify
y = 87
Hence the value of y when the value of x is 8 is 87
Learn more on function and values here: brainly.com/question/10439235
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Answer:
28.3 centimeters and 21 centimeters
Step-by-step explanation:
28.3 + 0.05) cm, so 28.25 cm ≤ length < 28.35 cm.
