Question

15. Solve the system by graphing. 2x+9=y, y=-4x-3

16. Solve the system using substitution. 4y+19=x, 3y-x-13

17. Solve the system using elimination. 3x+2y=17, 4x-2y=4

Answer 1

16.
`4y + 19 = x \:`→
`equ(i)`

`3y - x = - 13`→
`equ(ii)`

x is already the subject of formula in equation (i) so, we make use of it.

.:

`x = 4y + 19`

Replacing for the value of x in equation (ii):

`3y - 4y + 19 = - 13`

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