Solve algebraically
8x + 4y = 48
12x + 5y = 21

Step-by-step explanation:

Let's solve the first equation for x or y. I'll do it for y.

Subtract 8x

Divide by 4.

Simplify.

Now replace the value of y in the second equation for this.

Distribute 5

Subtract 60

Combine like terms;

Divide by 2.

Now replace this in any of the equations to find the value of y.

8 and 2 can be simplified.

8/2=4

2/2=1

Distribute 4.

Add 156

Divide by 4

Proof:

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places

false

step-by-step explanation:

the meaning of changing is to edit or make something different.

but transmitting means cause (something) to pass on from one place or person to another.

there 2 different things