Question

Use the Substitution Method to solve the following system of equations.
x - 4y = 1
2x - 9y = 3

(-1, -3)

(-3, 1)

(3, 1)

(-3, -1)

Answer 1

please

Answer 2

Solve for x first then plug that in

Answer 3

You could use substitution or elimination.

Answer 4

is this the answer (-3, 1)

Answer 5

x - 4y = 1----(1)
2x - 9y = 3---(2)

in equation (1)

x=1+4y

put in equation (2)
2(1+4y)-9y=3
2+8y-9y=3
2-y=3
y=-1

put in equation (1)
x-4(-1)=1
x+4=1
x=-3

so the solution is (x,y)=(-3,-1)

Answer 6

Sorry messed up a bit there:
A) x - 4y = 1
B) 2x - 9y = 3
Solve equation A for x
x = 1 + 4y then substitute this into Equation B