Question

-7x — '8y = -12
4х – бу = 28
Pls help it’s due tomorrow!

Answer 1

x=4 and y=−2

Explanation:

1. 3(−7x−8y=−12)

−4(4x−6y=28)

2. −21x−24y=−36

−16x+24y=−112

3. divide

4. Substitute 4 for x in−7x−8y=−12:

(−7)(4)−8y=−12

5. −8y−28+28=−12+28

divide 8 to 16

y=-2

Answer 2

• (4, -2)

Explanation:

Given system:

• -7x - 8y = -12
• 4х - 6у = 28

Simplify the second equation:

• 2x - 3y = 14

Solve the system by elimination, multiply the first equation by 2 and the second equation by 7 and add up. Solve for y:

• -7x(2) - 8y(2) + 2x(7) - 3y(7) = -12(2) + 14(7)
• -16y - 21y = -24 + 98
• -37y = 74
• y = -74/37
• y = -2

Find x using the second equation:

• 2x - 3(-2) = 14
• 2x = 14 - 6
• 2x = 8
• x = 4

Solution is (4, -2)