What is the solution to this system of equations? 4x + 5y = 7 3x – 2y = –12

x = -2 and y = 3

Step-by-step explanation:

It is given that,

4x + 5y = 7  (1)

3x – 2y = –12    ---(2)

To find the value of x and y

eq(1) * 3 ⇒

12x + 15y = 21   (3)

eq(2) * 4 ⇒

12x - 8y = -48  ---(4)

eq(3) - eq(4) ⇒

12x + 15y = 21   (3)

12x - 8y = -48  ---(4)

0 + 23y = 69

y = 69/23 = 3

y = 3

Substitute the value of y in eq(1)

4x + 5y = 7    (1)

4x + 5*3 = 7

4x = 7 - 15 = -8

x = -8/4 = -2

Therefore x = -2 and y = 3

ANSWER

x=-2,y=3

EXPLANATION

The system of equations is:

and

We multiply the first equation by 2.5 to get:

We add equations (1) and (3)

Divide both sides by 11.5

Put x=-2 into the first equation or any other equation and solve for y.

hey! so 1 (25) out of 4 (100) is 25 so your answer is 25%. it's like quarters!