X+7y=12 3x-5y=10

Question

Solving systems

Answer 1

x + 7y = 12 --- (1)
3x - 5y = 10 --- (2)

From (1), we have:

x = -7y + 12 --- (3)

Substituting (3) into (2), we will get:

3(-7y + 12) - 5y = 10
-21y + 36 - 5y = 10
-21y - 5y = 10 - 36
-26y = -26
y = -26 / -26
y = 1

Substituting y = 1 into (3), we will get:

x = -7(1) + 12
x = -7 + 12
x = 5

Hence, x = 5 and y = 1.

Answer 2

find the real solutions of the equation by graphing.  x^3-5x^2-18+72=0