Question

Solve the simultaneous equations x+2y=5; y=-2x-2​

Answer 1

Answer:

x=-3, y=4

Step-by-step explanation:

Substitute y=-2x-2 into another expression.

x+2(-2x-2)=5

-3x-4=5

-3x=9

∴ x=-3

Now we have the value of x, so substitute it into y=-2x-2.

y=6-2

∴ y=4

Answer 2

Answer:

y=4,

x=-3

Step-by-step explanation:

Let's take

x+2y=5---eq(I)

y=-2×-2----eq(ii)

y=4

Substitute equation ( ii) in equation (i)

x+2y=5

x+(2×4)=5

x+8=5

x=5-8

x = -3