Question

Y=9x-2
3x-2y=7
what is the value of x of the given system of equation
A)-3.8
B)3.8
C)-0.2
D) 0.2

Answer 1

y = 9x - 2
3x - 2y = 7
so sub in 9x - 2 for y in the 2nd equation and solve for x

3x - 2(9x - 2) = 7
3x - 18x + 4 = 7
3x - 18x = 7 - 4
-15x = 3
x = -3/15
x = -1/5 or - 0.2 <===