Question

Solve the system of equations: what is the x-value for the solution?

2x + 7y = 3 and x = 1 - 4y
A. -1
B. 5
C. 4
D. 3

Answer 1

Explain please

Answer 2

x = 5

Answer 3

since we are given an equation that determines the value of x if y is known; we can substitute this into the x portion of the other equation

Answer 4

y= (3-2x)/7
x=1-4(3-2x)/7

Answer 5

x = 1 - 4y

2x + 7y = 3 --> 2(1 - 4y) +7y = 3

we solve this for y to determine x

Answer 6

is one possible method .. ;)

Answer 7

2-8y+7y = 3

2-y = 3

y = -1
......................

x = 1-4y

x = 1-4(-1)

x = 1+4 = 5

Answer 8

thank you soo much