Use addition or substitution to find the value of x for this set of equations.top line 4x + 13y = 40 bottom line 4x + 3y = -40
Use addition or substitution to find the value of x for this set of equations.top line 4x + 13y = 40 bottom line 4x + 3y = -40
4x + 3y = -40
—
4x + 13y = 40
0 -10y = -80 ----> y = 8
Let's substitute "y" by 8 in first equation
4x + 3*8 = -40 ----> 4x + 24 = -40 ----> 4x = -40 - 24
4x = -64
x = -16
The answer is (-16, 8)
4x+13y= 40
4x+3y= -40
___________
subtract equation 2 from equation 1:
4x+13y =40
-4x-3y =-(-40)
______________
10y = 40+40=80
y=8
substitute y=8 in equation 1 or 2
4x+ 3y= - 40
4x + 3 (8) = -40
4x + 24= -40
4x= - 40-24
4x= -64
x = - 16
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