Question

(3) 3x + 4y = 12; 4y + 7x = 12​

Answer 1

Answer:

x=0 y=3

Step-by-step explanation:

3x+4y = 12

4y = 12+3y

y = $\frac{12+3y}{4}$

y= $\frac{12}{4} + \frac{3x}{4}$

y= 3 + $\frac{3x}{4}$  

Now, we will put this value on the other equation i.e.

4y+7x = 12

4( 3 + $\frac{3x}{4}$) + 7x = 12

(4*3) + (4 * $\frac{3x}{4}$) + 7x = 12

12 + 3x + 7x = 12

12 + 10x = 12

10x = 12 - 12

10x = 0

x = 0

Now, after finding the value of x, we would put it in equation 1 i.e. 3x + 4y = 12

(3*0) + 4y = 12

0 + 4y = 12

4y = 12

y = $\frac{12}{4}$

y = 3

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